Biostatistics

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By Jeremy D. Finn

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I also hope that as you use this book you lose any fear you might have of data and instead seek out and work with data and understand what they tell you about the things that got you interested in biology in the first place, like cats (or, more likely, dogs). WHAT THIS BOOK IS (AND ISN’T) This book is designed to help you collect, organize, analyze, and visualize data. I assume you have not heard of the free, open-source program R and I will, therefore, introduce you to how to use it to accomplish these goals.

Excel files), a presentation file, and maybe a lab report or paper. When you return to a project you open the script file, like any document from other programs, and get to work. Be sure to give the files and folders meaningful names and save your script file frequently. 2. To run a line of code in a script file you should have it open in RStudio. Place the cursor on the line you want to run and hit (Windows PC) or (Mac). You also can highlight any chunk of code, like you might do in other programs, and run only that which you have highlighted.

We’ll learn more about variables when we discuss data in chapter 2. Now that the data are in an array we can perform a variety of operations on them. 8 > summary(a) # more descriptive stats for "a" Min. 1st Qu. Median Mean 3rd Qu. Max. 0 Sometimes you will need to make a sequence of numbers. We can do that using the seq( ) function, instead of typing them all into the computer. The first line prints the sequence to the screen. seq. seq" We can now see that the numbers in square brackets represent the index number in arrays.

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