Methods in Biostatistics with R
A Rigorous and Practical Treatment of Biostatistics Foundations using R
The book provides a modern look at introductory Biostatistical concepts and the associated computational tools using the latest developments in computation and visualization in the R language environment. The book includes practical data analysis based on datasets that can be downloaded here: https://github.com/muschellij2/biostatmethods.
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The book provides a modern look at introductory Biostatistical concepts and the associated computational tools using the latest developments in computation and visualization in the R language environment. The book includes practical data analysis based on datasets that can be downloaded here: https://github.com/muschellij2/biostatmethods.
About
About the Book
Biostatistics is easy to teach poorly. Too often, books focus on methodology with no emphasis on programming and practical implementations. In contrast, books focused on R programming and visualization rarely discuss foundational topics that provide the infrastructure needed by data analysts to make decisions, evaluate analytic tools, and get ready for new and unforeseen challenges. Thus, we are bridging this divide that had no reason to exist in the first place. The book is unapologetic about its focus on Biostatistics, that is Statistics with Biological, Public Health, and Medical applications, though we think that it could be used successfully for large Statistical and Data Science Courses. Data and code can be downloaded here: https://github.com/muschellij2/biostatmethods
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About the Authors
Brian Caffo
Brian Caffo, PhD is a professor in the Department of Biostatistics at the Johns Hopkins Bloomberg School of Public Health. Along with Roger Peng and Jeff Leek, Dr. Caffo created the Data Science Specialization on Coursera. Dr. Caffo is leading expert in statistics and biostatistics and is the recipient of the PECASE award, the highest honor given by the US Government for early career scientists and engineers.
Episode 21
An Interview with Brian Caffo
Ciprian Crainiceanu
Ciprian Crainiceanu, PhD received his doctorate in statistics from Cornell University in 2003 and is a Professor of Biostatistics at Johns Hopkins University. He has taught the Master level Methods in Biostatistics course using and expanding on materials borrowed from Dr. Caffo, who, in turn, distilled materials developed over many years by other Johns Hopkins University Biostatistics faculty. Dr. Crainiceanu is a generalist, who likes to work in many different scientific areas. He has specialized in wearable and implantable technology (WIT) with application to health studies and Neuroimaging, especially in structural magnetic resonance imaging (MRI) and computed tomography (CT) with application to clinical studies. Drs. Crainiceanu and Caffo are the co-founders and co-directors of the Statistical Methods and Applications for Research in Technology ([SMART](http://www.smart-stats.org/)) research group.
Contents
Table of Contents
1 Introduction
1.1 Biostatistics
1.2 Mathematical prerequisites
1.3 R
2 Introduction to R
2.1 R and RStudio
2.2 Reading R code
2.3 R Syntax and Jargon
2.4 Objects
2.5 Assignment
2.6 Data Types
2.7 Data Containers
2.8 Logical Operations
2.9 Subsetting
2.10 Reassigment
2.11 Libraries and Packages
2.12 dplyr, ggplot2, and the tidyverse
2.13 Problems
3 Probability, random variables, distributions
3.1 Experiments
3.2 An intuitive introduction to the bootstrap
3.3 Probability
3.4 Probability calculus
3.5 Sampling in R
3.6 Random variables
3.7 Probability mass
3.8 Probability density function
3.9 Cumulative distribution function
3.10 Quantiles
3.11 Problems
3.12 Supplementary R training
4 Mean and Variance
4.1 Mean or expected value
4.2 Sample mean and bias
4.3 Variance, standard deviation, coefficient of variation
4.4 Variance interpretation: Chebyshev’s inequality
4.5 Supplementary R training
4.6 Problems
5 Random vectors, independence, covariance, and sample mean
5.1 Random vectors
5.2 Independent events and variables
5.3 Covariance and correlation
5.4 Variance of sums of variables
5.5 Sample variance
5.6 Mixture of distributions
5.7 Problems
6 Conditional distribution, Bayes’ rule, ROC
6.1 Conditional probabilities
6.2 Bayes rule
6.3 ROC and AUC
6.4 Problems
7 Likelihood
7.1 Likelihood definition and interpretation
7.2 Maximum likelihood
7.3 Interpreting likelihood ratios
7.4 Likelihood for multiple parameters
7.5 Profile likelihood
7.6 Problems
8 Data visualization
8.1 Standard visualization tools
8.2 Problems
9 Approximation results and confidence intervals
9.1 Limits
9.2 Law of Large Numbers (LLN)
9.3 Central Limit Theorem (CLT)
9.4 Confidence intervals
9.5 Problems
10 The χ 2 and t distributions
10.1 The χ 2 distribution
10.2 Confidence intervals for the variance of a Normal
10.3 Student’s t distribution
10.4 Confidence intervals for Normal means
10.5 Problems
11 t and F tests
11.1 Independent group t confidence intervals
11.2 t intervals for unequal variances
11.3 t-tests and confidence intervals in R
11.4 The F distribution
11.5 Confidence intervals and testing for variance ratios of Normal distributions
11.6 Problems
12 Data Resampling Techniques
12.1 The jackknife
12.2 Bootstrap
12.3 Problems
13 Taking logs of data
13.1 Brief review
13.2 Taking logs of data
13.3 Interpreting logged data
13.4 Inference for the Geometric Mean
13.5 Summary
13.6 Problems
14 Interval estimation for binomial probabilities
14.1 Introduction
14.2 The Wald interval
14.3 Bayesian intervals
14.4 Connections with the Agresti/Coull interval
14.5 Conducting Bayesian inference
14.6 The exact, Clopper-Pearson method
14.7 Confidence intervals in R
14.8 Problems
15 Building a Figure in ggplot2
15.1 The qplot function
15.2 The ggplot function
15.3 Making plots better
15.4 Make the Axes/Labels Bigger
15.5 Make the Labels to be full names
15.6 Making a better legend
15.7 Legend INSIDE the plot
15.8 Saving figures: devices
15.9 Interactive graphics with one function
15.10 Conclusions
15.11 Problems
16 Hypothesis testing
16.1 Introduction
16.2 General hypothesis tests
16.3 Connection with confidence intervals
16.4 Data Example
16.5 P-values
16.6 Discussion
16.7 Problems
17 Power
17.1 Introduction
17.2 Standard normal power calculations
17.3 Power for the t test
17.4 Discussion
17.5 Problems
18 R Programming in the Tidyverse
18.1 Data objects in the tidyverse: tibbles
18.2 dplyr: pliers for manipulating data
18.3 Grouping data
18.4 Summarizing grouped
18.5 Merging Data Sets
18.6 Left Join
18.7 Right Join
18.8 Right Join: Switching arguments
18.9 Full Join
18.10 Reshaping Data Sets
18.11 Recoding Variables
18.12 Cleaning strings: the stringr package
18.13 Problems
19 Sample size calculations
19.1 Introduction
19.2 Sample size calculation for continuous data
19.3 Sample size calculation for binary data
19.4 Sample size calculations using exact tests
19.5 Sample size calculation with preliminary data
19.6 Problems
20 References
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