R 1.2 - Calculations and Variables-S-o-sdlzhkE.mp4
Get acquainted with performing basic computations in R, creating R objects (sometimes called "variables"), and seeing and running earlier commands that were run in the console.
R 1.3 - Create and Work With Vectors-YhQOV27pQfg.mp4
Learn how to create a vector in R using the c() function and the colon-notation (e.g. 1:5), find the length of a vector using the length() function, and subset vectors with bracket-notation and the head() and tail() functions.
R 1.4 - Character and Boolean Vectors-GKu5tw_bIpA.mp4
So far we've seen objects that use numbers, but R is also built to handle more types of objects. Here we explore vectors that contain strings or Boolean values (TRUE / FALSE).
This video demystifies the different ways R performs vector arithmetic (e.g. addition and multiplication), covering topics including element-wise arithmetic, vector recycling, and how some functions are automatically applied across the ele…
R 1.6 - Building and Subsetting Matrices-cR-hEUs1rRw.mp4
Learn how to create a matrix with dimensions of your choosing, how recycle a vector when creating a matrix, and how to query specific characteristics of the vector using functions such as dim(), head(), and tail(). Details and potential …
R 1.7 - Section 1 Review and Help Files-mtu5_IYhgpg.mp4
A quick review of the topics covered in the Section 1 videos: vectors, matrices, subsetting, and a few standard functions. Also learn how to access help files in R.
R 2.1 - Loading Data and Working With Data Frames-qK1ElUMkhq0.mp4
Get a refresher on navigating directories on your computer in R, and learn to load a CSV (comma-separated values) data set in the form of a "data frame" using the read.csv() function, which is a special type of data matrix. This vide…
R 2.2 - Loading Data, Object Summaries, and Dates-cx_3zWo4sUs.mp4
Learn how to load data in the form of a tab-delimited text file using the read.delim(), how to get a high-level overview of an R object using the str() and summary() functions, and get a crash-course into working with dates in R with an exa…
R 2.3 - if() Statements, Logical Operators, and the which() Function-eVEx_pBEkRI.mp4
if-else statements are a key component to any programming language. This video introduces how to effectively use these statements in R and also clarifies some nuances of logical operators in R. Two related functions are also intro…
R 2.4 - for() Loops and Handling Missing Observations-djI-yfk-DZM.mp4
This video discusses for() loops, which are a structure that can be used to execute a set of code repeatedly. Also covered in this video are the min(), max(), and append() functions, as well as how to identify and omit missing value…
R 3.1 - Managing the Workspace and Variable Casting-8oc3mIa0TCw.mp4
View all the objects in the workspace using ls(), remove objects using rm(), cast a variable as a different type using an as.[type]() function, and use lists or data frames to organize data or results.
R 3.2 - The apply() Family of Functions-WuCVs3bW-ZY.mp4
When data are organized in a matrix or data frame, the apply() function can be used to calculate summaries (or apply a more complex function) across either the rows or columns of the data object. Or if summaries for each group (level) …
R 3.3 - Access or Create Columns in Data Frames, or Simplify a Data Frame using aggregate()-pZ6Bnxg9E8w.mp4
The with() function makes it easy to access many variables (columns) in a data frame for one-off calculations, the within() function can be used to create new columns that are merged with the original data frame, and aggregate() is…
R 4.2 - Returning a List and Providing Default Arguments-DzIy6U-N6ac.mp4
Become more proficient in writing functions by learning the standard way to return more complex results from functions using a list, and learn how to specify a default value for an argument.
R 4.3 - Add a Warning or Stop the Function Execution-29TdKkUmcA4.mp4
The most helpful functions return clear warnings and errors when something is wrong. This video introduces the warning() and stop() functions, which can be used within a function to report a warning to the user or stop the functio…
R 4.4 - Passing Additional Arguments Using an Ellipsis-O3Bf2hM_gNc.mp4
Sometimes it is useful to be able to pass any extra arguments to another function. For example, if a new plotting function is created that makes use of the function called plot(), it would be useful to be able to be able to specify add…
R 4.5 - Make a Returned Result Invisible and Build Recursive Functions-CHmmHfJ8hCA.mp4
Use the invisible() function in place of return() in a function to prevent the output from printing to the user's screen but still allow the result to be stored into an R object. Additionally, when building a recursive function, use the Recall() fu…
R 4.6 - Custom Functions With apply()-H06_Ic_kDvI.mp4
In the last section of videos, the apply() function was introduced. A prebuilt function is often used in this function, but it is also common to write a new function within apply() or to apply a custom function.
R 1.1 - Initial Setup and Navigation-iffR3fWv4xw.zip
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