Summarize Variables
Look at the summarize function and how to use it to create summaries of data.
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Summary statistics are single numerical values that summarize a large number of values. Commonly known examples of summary statistics include the mean (also called the average) and the median (the middle value). Other examples of summary statistics that might not immediately come to mind include the sum, the minimum (the smallest value), the maximum (the largest value) and the standard deviation.
Let’s calculate two summary statistics of temp, a temperature variable in the weather data frame (from the nycflights13 package): the mean and standard deviation. To compute these summary statistics, we need the mean() and sd() summary functions in R. Summary functions in R take in many values and return a single value.
More precisely, we’ll use the mean() and sd() ...