Bachelor of Science in Sports Analytics

Sports + Data Science = Sports Analytics! Fun, functions and fantastic career for those interested in sports of any kind. This field of analytics is rapidly growing and becoming applicable to every sport. There is a critical need to develop and train high quality, ethical and interdisciplinary individuals with skills in this field. Working with innovative technical skills and mathematical talent, applications span every field of human sport endeavor. This career is a win all the way around!

Why CBU?

The flood of data being generated in the 21st century requires scientists who apply mathematics and computer science techniques. CBU’s sports analytics program establishes an interdisciplinary mechanism where sport applications can interface with statistically and mathematically trained individuals.

Career Opportunities

  1. Team Sports Analyst/Statistician - Translate the analytics to a Coach, Scout, or GM so they can incorporate it in their strategy.
  2. Television Network Sports Analyst/Statistician – Provide analysis for a television network to incorporate in their programming.
  3. Data Service Analyst - Analyst responsible for editorial and research content in a data agency's publications and websites.
  4. Independent Statistical Consultant - Consultant contracted to produce detailed statistical reports for various teams.

Links

  1. http://www.bls.gov/careeroutlook/2015/interview/sports-statistical-analyst.htm
  2. http://www.amstat.org/policy/pdfs/StatSigSports.pdf
  3. http://stattrak.amstat.org/2012/08/01/sports-statistician/
  4. http://thisisstatistics.org/
  5. http://www.bestcolleges.com/resources/statistics/

Sports Analytics (40–50 units) BS

Lower Division Requirements

STA144 Introduction to Statistics

Mathematical theory and applications, development of formulae, principles of statistical decision theory, descriptive measurements, probability concepts, random variables, normal distribution, inferential statistics, sampling distributions, confidence intervals, hypothesis testing, chi-squared procedures, linear regression, and the use of computers in statistics. Prerequisite: MAT 115 or sufficient SAT, ACT or math placement exam scores and appropriate high school mathematics background. (3 units; Fall/Spring)

STA144-E
Knisley, Benjamin David
09/05/2017 TTh 5:30 PM - 7:00 PM BUS 106
STA144-F
Knisley, Benjamin David
09/05/2017 TTh 7:15 PM - 8:45 PM BUS 203
STA144-C
Wood, Daniel A.
09/05/2017 MWF 9:30 AM - 10:30 AM Yeager Center B221
STA144-D
Wood, Daniel A.
09/05/2017 MWF 10:45 AM - 11:45 AM Yeager Center B221
STA144-B
Wood, Daniel A.
09/05/2017 MWF 8:15 AM - 9:15 AM Yeager Center B221
STA144-A
Carothers, Linn E.
09/05/2017 MWF 12:00 PM - 1:00 PM BUS 125
STA144-C
Knisley, Benjamin David
01/10/2018 T 6:00 PM - 9:00 PM TBA
STA144-B
Carothers, Linn E.
01/10/2018 MWF 1:15 PM - 2:15 PM Yeager Center A110
STA144-A
Carothers, Linn E.
01/10/2018 MWF 12:00 PM - 1:00 PM Yeager Center A110
STA144-A
Knisley, Benjamin David
05/07/2018 TTh 3:45 PM - 5:15 PM TBA
STA144-B
Knisley, Benjamin David
07/02/2018 TTh 3:45 PM - 5:15 PM TBA

STA205 Applied Linear Regression

This course represents a basic concepts and methodology course in regression analysis using application of general linear regression models to real-life situations. Case studies are used to give practice in diagnosing practical problems, deciding on appropriate models, and knowing which inferential technique will answer the researcher’s questions for the purposes of description and prediction. Regression models and model building typical of problems used in the social and behavioral sciences, the natural and health sciences, and many other disciplines are covered. Prerequisite: STA 144. (3 units; Spring even years)

STA205-A
Noh, Heewon Esther_AKA:_Esther_L
01/10/2018 TTh 10:30 AM - 12:00 PM Yeager Center B259

STA210 Statistical Computing I

An introduction to data mining, management and statistical programming techniques using comprehensive and widely available tools like SAGE, SPSS, SAS and R. Students learn exploratory data analysis, coding and manipulation of variables, database management applying statistical concepts. Modeling and simulation experiments on a variety of applied data sets. Prerequisites: STA 144. (3 units; Fall odd years)

STA210-A
Noh, Heewon Esther_AKA:_Esther_L
09/05/2017 TTh 2:00 PM - 3:30 PM Yeager Center B222

Choose one of the following:

CIS268 Computer Programming Languages

In this course concepts of computer programming languages are presented. Attention is given to the common constructs of programming languages as well as a structured approach to program development. The programming language may change from semester to semester. (3 units; Spring)

CIS268-A
Corso, Anthony J.
01/10/2018 MWF 8:15 AM - 9:15 AM Yeager Center B113

EGR121 Intro Computer Programming C++

Introduction to computer science. Covers problem solving methods and algorithm development; modern programming methodologies; and fundamentals of high-level block structured language using C++. Prerequisite: MAT 115 and his/her demonstrable computer literacy. Prerequisite: EGR 181 or MAT 115. (3 units; Interdisciplinary; Fall/Spring)

EGR121-A
Kolta, Michael J.
09/05/2017 MWF 2:30 PM - 3:30 PM Engr Building 3739 Adams 130H
EGR121-C
Shade, Karen S
09/05/2017 MWF 1:15 PM - 2:15 PM Engr Building 3739 Adams 215E
EGR121-B
Kolta, Michael J.
09/05/2017 MWF 8:15 AM - 9:15 AM Engr Building 3739 Adams 100J
EGR121-D
Shade, Karen S
09/05/2017 MWF 3:45 PM - 4:45 PM Engr Building 3739 Adams 100J
EGR121-B
Kolta, Michael J.
01/10/2018 MWF 3:45 PM - 4:45 PM Engr Building 3739 Adams 100J
EGR121-D
Xu, Xuping
01/10/2018 MWF 8:15 AM - 9:15 AM Engr Building 3739 Adams 100J
EGR121-A
Shade, Karen S
01/10/2018 MWF 9:30 AM - 10:30 AM Engr Building 3739 Adams 215E
EGR121-C
Im, Kyungsoo
01/10/2018 MWF 10:45 AM - 11:45 AM Engr Building 3739 Adams 100J

Upper Division Requirements

STA303 Research & Experimental Design

This course studies experimental designs with corresponding models and analyses critical for students in the empirical sciences. Course topics include estimation, test of hypothesis, analysis of variance and a variety of topics in experimental design. Decisions and practical considerations which minimize experimental error and avoid confounding results are dealt with in real life contexts. Prerequisite: STA 144. (3 units; Fall odd years)

STA303-A
Noh, Heewon Esther_AKA:_Esther_L
09/05/2017 TTh 3:45 PM - 5:15 PM BUS 106

STA360 Data Visualization

This course provides the tools to create and critically evaluate data visualizations. Focus will be on statistical graphics, graphics that display statistical data. Additionally, recent advances in the field of information visualization will be covered. Prerequisite: STA144 (3 units; Spring Even)

STA360-A
Carothers, Linn E.
01/10/2018 TTh 2:00 PM - 3:30 PM Yeager Center ONLN

STA362 Advanced Statistical Computing

A course to introduce statistical models of advanced least squares regression and standard ANOVA techniques and extensions to categorical data. Students will conceptually understand linear mixed effects models, log linear and generalized linear models for count data; and survival models for the analysis of lifetime data. In addition, students will apply these models to real data, to discern patterns and conclusions, and present their results. Prerequisite: STA205 & STA210 (3 units; Fall Even)

STA364 Applied Statistical Methodology

A course in application of parametric and nonparametric single and multivariable data analytic techniques to sports. Topics will include: linear regression, correlation, confounding and interactions, variable selection, categorical predictors and outcomes, logistic regression, factor analysis, discriminant analysis, and regression techniques with longitudinal data. Prerequisite: STA210 (3 units; Spring Odd)

STA460 Sports Analytics Seminar

This course enables students to examine theory and applications of data science and analytics to the field of sports performance, administration, and player rehabilitation. Students will evaluate evidence based literature related to statistical analysis to determine whether a published study has reliable results which can be used in translating evidence to practice. Topics may include aspects of sports strategy, team and player performance, teach and franchise management, officiating and refereeing, coaching and training issues, fan support and marketing, fantasy competitions, and contemporary topics of metrics and technology use (limitations and extensions). (1 unit; Spring Odd)

STA491 Sports Analytics Internship

This course is aimed at developing “hands on” experience in data and visualization analytic skills in the context of involvement with a sport team, league, or corporation. Students will assist in the development of the analytical and data collection capabilities of the organization. (1-3 units; Fall; Spring; Summer)

STA499 Capstone

The course is designed to be a culminating experience for senior students. The course gives students through writing, seminar and conference participation, an opportunity to demonstrate their skill and proficiency in the field of statistics. In some cases, this may be coupled with internships. Prerequisite: Permission of Department Chair. (1-3 units; Spring)

STA499-A
Carothers, Linn E.
09/05/2017 MWF 12:00 PM - 1:00 PM BUS 125
STA499-A
Carothers, Linn E.
01/10/2018 MWF 12:00 PM - 1:00 PM Yeager Center A110

Concentration Courses (12–22 units)

Students must complete all of the requirements in one of the following concentrations:
  • Sports Performance Analytics (12 units)
  • Quantitative Sport Business (22 units)
  • Rehabilitative Sports Analytics (19 uits)

Sports Performance Analytics (12 units)

KIN305 Applied Sport Management

A study of basic management principles and their application to the field of sport. (3 units; Fall)

KIN305-A
Sullivan, Sean
09/05/2017 Th 8:45 AM - 10:15 AM Health Science Campus ONLN

KIN315 Sport Governance

This course is an examination of sport organizations focused on both professional and amateur governance structures and processes. The study of policy in educational, non-profit, professional and international sport venues will also be addressed. (3.0 units; Spring, As Offered)

KIN315-A
Sullivan, Sean
01/10/2018 Th 8:45 AM - 10:15 AM Health Science Campus ONLN

KIN454 Behavioral Aspects of Sport

A study of the sociological and psychological impact of physical activity on humans. The psychological factors of self-perception, motivation, cooperation, and competition will be examined and used as descriptors to illustrate the idea of sport as an institution of society. (3 units; Interdisciplinary; Spring)

KIN454-A
White, Clinton Jamar
09/05/2017 W 5:00 PM - 8:00 PM Health Science Campus ONLN
KIN454-A
White, Clinton Jamar
01/10/2018 T 5:00 PM - 8:00 PM Health Science Campus ONLN

Choose one of the following:

STA305 Sampling & Survey Methodology

Sampling theory and practice are presented in this course through a study of simple random samples, stratified random samples, cluster sampling, estimating sample size, ratio estimates, subsampling, two-state sampling and analysis of sampling error. This is a critical course for students in education and the social, medical, biological and management sciences where sampling is a fundamental step in virtually every statistical procedure and critical to meaningful survey research. (3 units, Fall even years)

STA462 Measurement & Evaluation

This course is designed to develop an understanding of measurement and evaluation concepts. Measurement and evaluation topics relevant to construction and use of assessment in the psychomotor, cognitive and affective domains will be covered. Class activities include collection, analysis of data, and evaluation of instruments for personal and program evaluation. (3 units; Fall Odd)

STA462-A
Carothers, Linn E.
09/05/2017 TTh 2:00 PM - 3:30 PM Instructor OFFC

Quantitative Sport Business (22 units)

BUS217 Microeconomics

This course studies economic behavior at the individual level. Topics include decision-making processes of households and firms, supply and demand, elasticity, and marginal analysis. Market structure and public policy are examined to evaluate their impact on economic welfare and the allocation of scarce resources. (3 units; Fall/Spring)

BUS217-B
Keyes-Kimbirk, Wendy R
09/05/2017 MWF 12:00 PM - 1:00 PM BUS 123
BUS217-C
Keyes-Kimbirk, Wendy R
09/05/2017 MWF 9:30 AM - 10:30 AM BUS 204
BUS217-A
Namvar, Bob
09/05/2017 TTh 12:15 PM - 1:45 PM BUS 204
BUS217-B
Keyes-Kimbirk, Wendy R
01/10/2018 MWF 12:00 PM - 1:00 PM BUS 204
BUS217-A
Namvar, Bob
01/10/2018 TTh 10:30 AM - 12:00 PM BUS 202

BUS218 Macroeconomics

This course offers a common sense approach to economics, covering basic economic laws and how they apply to our world and everyday life. The course focuses on the overall economy and economic theories that offer explanations for its fluctuations and changes. Also, the course is designed to give the student a sufficient grounding in the terminology, basic concepts, and issues of economics to stimulate interest in further study and provide background in business. (3 units; Fall/Spring)

BUS218-A
Keyes-Kimbirk, Wendy R
09/05/2017 Th 2:00 PM - 5:00 PM BUS 204
BUS218-B
Namvar, Bob
09/05/2017 TTh 10:30 AM - 12:00 PM BUS 204
BUS218-A
Namvar, Bob
01/10/2018 Th 2:00 PM - 5:00 PM BUS 202
BUS218-B
Namvar, Bob
01/10/2018 TTh 12:15 PM - 1:45 PM BUS 202
BUS218-C
Keyes-Kimbirk, Wendy R
01/10/2018 MWF 9:30 AM - 10:30 AM BUS 202

BUS463 Business & Organizational Mgmt

This course is the study of management theories and the functional concepts of leadership, planning, and decision making. Special emphasis is placed on quality issues, globalism, diversity, ethics, productivity, motivation, skill development, and human resource management. An emphasis on integrating biblical principles and leadership will also be studied. (3 units; Fall/Spring)

BUS463-A
Walls, John L.
09/05/2017 MWF 12:00 PM - 1:00 PM BUS 103
BUS463-B
Hove, Tad A.
09/05/2017 TTh 2:00 PM - 3:30 PM BUS 252
BUS463-B
Herrity, Andrew C.
01/10/2018 MWF 8:15 AM - 9:15 AM BUS 106
BUS463-C
Bigley, Joel Douglas
01/10/2018 TTh 2:00 PM - 3:30 PM TBA
BUS463-A
Alderson, Keanon J.
01/10/2018 W 2:30 PM - 5:30 PM BUS 253

KIN305 Applied Sport Management

A study of basic management principles and their application to the field of sport. (3 units; Fall)

KIN305-A
Sullivan, Sean
09/05/2017 Th 8:45 AM - 10:15 AM Health Science Campus ONLN

MAT245 Analytical Geometry & Calculus I

Basic concepts of analytical geometry, limits and derivatives, differentials and rates, integration, definite and indefinite integrals, differentiation of logarithmic and exponential functions. Prerequisite: MAT 135, 145, EGR 182, or sufficient SAT, ACT or math placement exam scores and appropriate high school mathematics background. (4 units; Fall/Spring)

MAT245-D
Erickson, Sheraya Linn
09/05/2017 MWF 8:45 AM - 9:30 AM Yeager Center B222
MAT245-E
Erickson, Sheraya Linn
09/05/2017 MWF 9:30 AM - 10:15 AM Yeager Center B222
MAT245-A
Cordero, Ricardo J.
09/05/2017 MWF 7:00 AM - 7:45 AM BUS 103
MAT245-C
Cordero, Ricardo J.
09/05/2017 Th 8:15 AM - 9:15 AM BUS 123
MAT245-B
Cordero, Ricardo J.
09/05/2017 MWF 7:45 AM - 8:30 AM BUS 103
MAT245-D
Nielsen Hernandez, Michelle
01/10/2018 W 9:30 AM - 10:30 AM BUS 204
MAT245-C
Nielsen Hernandez, Michelle
01/10/2018 W 9:30 AM - 10:30 AM BUS 204
MAT245-A
Nielsen Hernandez, Michelle
01/10/2018 W 8:15 AM - 9:15 AM BUS 204
MAT245-B
Nielsen Hernandez, Michelle
01/10/2018 W 8:15 AM - 9:15 AM BUS 204
MAT245-A
Willett, Robert James
05/07/2018 MTWTh 10:30 AM - 12:30 PM TBA

MAT353 Probability & Statistics

A calculus based course covering discrete and continuous distributions, expectations, the normal distribution, the central limit theorem, the binomial distribution, and various topics in statistical theory such as point estimation, hypothesis testing, and linear regression. Prerequisite: MAT 245. (3 units; Fall)

MAT353-A
Nielsen Hernandez, Michelle
09/05/2017 MWF 8:15 AM - 9:15 AM BUS 103

STA320 Financial Mathematics I

An introduction to the fundamental concepts of financial mathematics including basic interest theory. These concepts will be applied in calculating present and accumulated values for various streams of cash flows as a basis for future use in: reserving, valuation, pricing, asset/liability management, investment income, capital budgeting, and valuing contingent cash flow. Prerequisite: MAT245 and STA144 (3 units; Fall Even)

Rehabilitative Sports Analytics (19 units)

BIO153 Anatomy & Physiology I w/ Lab

This course is designed for professional nursing and general college students. Included are a general survey of human histology and the study of structure and function of organ systems of the human body, including the integumentary, skeletal, muscular, endocrine and nervous systems. Structure and function of sensory organs are also included in the course. Correlated by laboratory experience and demonstration. Lecture (3 units) and required laboratory (1 unit). Additional lab fee. (4 units; Fall/Spring)

BIO153-V
Wilson, Caridad Caballes
09/05/2017 Sa 8:00 AM - 12:00 PM Mission Hall ONLN
BIO153-Y
Runyan, Stephen A.
09/05/2017 F 12:00 PM - 1:00 PM BUS 203
BIO153-F
Prins, Bruce
09/05/2017 F 7:00 AM - 8:00 AM Yeager Center A112
BIO153-X
Runyan, Stephen A.
09/05/2017 T 12:00 PM - 1:00 PM BUS 203
BIO153-R
Heyman, Nathanael S
09/05/2017 F 12:15 PM - 1:45 PM Yeager Center A112
BIO153-H
Prins, Bruce
09/05/2017 W 8:15 AM - 9:15 AM Yeager Center A112
BIO153-G
Prins, Bruce
09/05/2017 M 7:00 AM - 8:00 AM Yeager Center A112
BIO153-K
Prins, Bruce
09/05/2017 Th 8:15 AM - 9:15 AM Yeager Center A112
BIO153-C
Prins, Bruce
09/05/2017 T 7:00 AM - 8:00 AM Yeager Center A112
BIO153-E
Prins, Bruce
09/05/2017 Th 7:00 AM - 8:00 AM Yeager Center A112
BIO153-J
Prins, Bruce
09/05/2017 Th 8:15 AM - 9:15 AM Yeager Center A112
BIO153-M
Prins, Bruce
09/05/2017 T 8:15 AM - 9:15 AM Yeager Center A112
BIO153-Q
Heyman, Nathanael S
09/05/2017 M 12:15 PM - 1:45 PM Yeager Center A112
BIO153-S
Heyman, Nathanael S
09/05/2017 F 12:15 PM - 1:45 PM Yeager Center A112
BIO153-B
Prins, Bruce
09/05/2017 M 7:00 AM - 8:00 AM Yeager Center A112
BIO153-D
Prins, Bruce
09/05/2017 W 7:00 AM - 8:00 AM Yeager Center A112
BIO153-I
Prins, Bruce
09/05/2017 Th 8:15 AM - 9:15 AM Yeager Center A112
BIO153-O
Heyman, Nathanael S
09/05/2017 F 12:15 PM - 1:45 PM Yeager Center A112
BIO153-T
Heyman, Nathanael S
09/05/2017 Th 12:15 PM - 1:45 PM Yeager Center A112
BIO153-L
Prins, Bruce
09/05/2017 F 8:15 AM - 9:15 AM Yeager Center A112
BIO153-N
Prins, Bruce
09/05/2017 W 8:15 AM - 9:15 AM Yeager Center A112
BIO153-P
Heyman, Nathanael S
09/05/2017 W 12:15 PM - 1:45 PM Yeager Center A112
BIO153-U
Heyman, Nathanael S
09/05/2017 F 12:15 PM - 1:45 PM Yeager Center A112
BIO153-W
Runyan, Stephen A.
09/05/2017 T 12:00 PM - 1:00 PM BUS 203
BIO153-A
Prins, Bruce
09/05/2017 M 7:00 AM - 8:00 AM Yeager Center A112
BIO153-H
Runyan, Stephen A.
01/08/2018 Sa 8:00 AM - 11:50 AM Mission Hall ONLN
BIO153-D
Heyman, Nathanael S
01/10/2018 F 12:15 PM - 1:45 PM Yeager Center A112
BIO153-E
Heyman, Nathanael S
01/10/2018 W 12:15 PM - 1:45 PM Yeager Center A112
BIO153-F
Heyman, Nathanael S
01/10/2018 F 12:15 PM - 1:45 PM Yeager Center A112
BIO153-C
Heyman, Nathanael S
01/10/2018 F 12:15 PM - 1:45 PM Yeager Center A112
BIO153-G
Heyman, Nathanael S
01/10/2018 W 12:15 PM - 1:45 PM Yeager Center A112
BIO153-B
Heyman, Nathanael S
01/10/2018 W 12:15 PM - 1:45 PM Yeager Center A112
BIO153-A
Heyman, Nathanael S
01/10/2018 W 12:15 PM - 1:45 PM Yeager Center A112
BIO153-A
Runyan, Stephen A.
05/07/2018 T 9:00 AM - 12:00 PM TBA
BIO153-B
Runyan, Stephen A.
05/07/2018 Sa 8:00 AM - 11:50 AM Mission Hall ONLN

KIN264 Movement Anatomy

A study of the muscle and bone structure of the human body and how they work together to create movement. Emphasis is on the function of specific muscles and bones in creating defined movement. Prerequisite: BIO153. (3 units; Interdisciplinary; Spring)

KIN264-B
Adams, Jordan
09/05/2017 MWF 12:00 PM - 1:00 PM Health Science Campus L248
KIN264-A
Edmisten, Jan S.
09/05/2017 MWF 10:45 AM - 11:45 AM Health Science Campus A015
KIN264-B
Adams, Jordan
01/10/2018 MWF 10:45 AM - 11:45 AM Health Science Campus L247

KIN353 Care & Prev of Athl Injury

A course providing instruction and experience in the prevention and care of injuries incurred in athletics. Methods of taping, therapy, health habits, and protective equipment are considered. Prerequisite: KIN 253 or 264. (3 units; Fall/Spring)

KIN353-A
White, Clinton Jamar
09/05/2017 TTh 12:15 PM - 1:45 PM Health Science Campus L240
KIN353-A
White, Clinton Jamar
01/10/2018 TTh 8:45 AM - 10:15 AM Health Science Campus L249

KIN454 Behavioral Aspects of Sport

A study of the sociological and psychological impact of physical activity on humans. The psychological factors of self-perception, motivation, cooperation, and competition will be examined and used as descriptors to illustrate the idea of sport as an institution of society. (3 units; Interdisciplinary; Spring)

KIN454-A
White, Clinton Jamar
09/05/2017 W 5:00 PM - 8:00 PM Health Science Campus ONLN
KIN454-A
White, Clinton Jamar
01/10/2018 T 5:00 PM - 8:00 PM Health Science Campus ONLN

STA462 Measurement & Evaluation

This course is designed to develop an understanding of measurement and evaluation concepts. Measurement and evaluation topics relevant to construction and use of assessment in the psychomotor, cognitive and affective domains will be covered. Class activities include collection, analysis of data, and evaluation of instruments for personal and program evaluation. (3 units; Fall Odd)

STA462-A
Carothers, Linn E.
09/05/2017 TTh 2:00 PM - 3:30 PM Instructor OFFC

Choose one of the following courses:

KIN383 Exercise Physiology

Physiological principles of exercise. Topics include the responses and adaptations of the neuromuscular system, bioenergetics, and the endocrine, cardiovascular and pulmonary systems to exercise. Prerequisite: BIO153. (3 units; Fall/Spring)

KIN383-B
Boyer, William
09/05/2017 MWF 8:15 AM - 9:15 AM Health Science Campus ONLN
KIN383-A
Gillum, Trevor L.
09/05/2017 MW 10:45 AM - 11:45 AM Health Science Campus ONLN
KIN383-B
Boyer, William
01/10/2018 MW 8:15 AM - 9:15 AM Health Science Campus ONLN
KIN383-A
Gillum, Trevor L.
01/10/2018 MW 9:30 AM - 10:30 AM Health Science Campus ONLN

KIN490 Prin of Conditioning Athletes

A study of the physiological and biomechanical basis of conditioning for different sports. Topics include bioenergetics, specificity of training, periodization, and organization and administration of the strength and conditioning facility. Prerequisites: KIN274 and KIN383. (3 units; Fall, Spring)

KIN490-A
Miller, Amy
09/05/2017 TTh 8:45 AM - 10:15 AM Health Science Campus A013
KIN490-A
Miller, Amy
01/10/2018 TTh 2:00 PM - 3:30 PM Health Science Campus