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How to Calculate Lag by Group in R?, The dplyr package in R can be used to calculate lagged values by group using the following syntax. Subsetting with multiple conditions in R – Data...

Select the First Row by Group in R, using the dplyr package in R, you might wish to choose the first row in each group frequently. To do this, use the simple syntax shown...

How to Group and Summarize Data in R?, Grouping and summarising data are two of the most frequent actions you’ll conduct in data analysis. How to add labels at the end of each line...

How to Find Unmatched Records in R?, To retrieve all rows in one data frame that do not have matching values in another data frame, use the anti_join() function from the dplyr package in...

How to Use “not in” operator in Filter, To filter for rows in a data frame that is not in a list of values, use the following basic syntax in dplyr. How to compare...

Augmented Dickey-Fuller Test in R, If a time series has no trend, constant variance over time, and a consistent autocorrelation structure across time, it is considered to be “stationary.” An augmented Dickey-Fuller test, which...

droplevels in R with examples, To remove unneeded factor levels, use R’s droplevels() function. This function comes in handy when we need to get rid of factor levels that are no longer in use...

Count Observations by Group in R, want to count the number of observations by the group. Fortunately, the count() function from the dplyr library makes this simple. Using the data frame below, this tutorial...

How to add columns to a data frame in R?, To add one or more columns to a data frame in R, use the mutate() function from the dplyr package. With the following data...