Modern R Programming Cookbook

How to do it...

Let's take a look at the following steps to see how we can use the select() verb for data processing:

1. The first step is always to import the dataset and then do the specific operation. Here is the code to import the dataset and then use the select() verb to subset the dataset on the fly. There are other operators also shown in this task. For example, fitting a linear regression model of arrival delay with departure delay for each quarter as follows:

        USAairlineData2016 <- read.csv("USAairlineData2016.csv", as.is          = T)        selectExample <- USAairlineData2016 %>%        select(QUARTER, MONTH, ORIGIN, DEST, DEP_DELAY, ARR_DELAY) %>%        group_by(QUARTER) %>%        do(regModel = lm(ARR_DELAY ~ DEP_DELAY, data=.)) %>% summarise(intercept = coef(regModel)[1], ...