Split

To calculate the proportions for all years, you will use the function female_residence_prop() defined in the previous exercise along with three other functions:

split(): To "split" the mort data by year
Map(): To "apply" the function female_residence_prop() to each of the subsets returned from split()
Reduce(): To combine the results obtained from Map()

In this exercise, you will "split" the mort data by year.

This exercise is part of the course

Scalable Data Processing in R

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Exercise instructions

Split the row numbers of the mortgage data by the "year" column and assign the result to spl.
Call str() on spl to see the results.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Split the row numbers of the mortage data by year
spl <- ___(1:nrow(___), mort[, ___])

# Call str on spl
___

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