In this section, we will see how we can convert a typical long layout to a typical wide layout and vice versa. To perform this conversion, we will use the built-in
reshape() function, which takes several arguments, but we will use the following arguments:
data: This argument specifies the dataset that we want to change the layout of.
direction: This argument specifies whether the data is long or wide. Note that here long and wide indicates the typical layout.
idvar: This argument specifies the identification variable. It could be a single variable or multiple variables.
timevar: This argument specifies how many times the values of
idvarrepeats for each subject.
The following example converts the long layout ...