Combining variables

Our data includes many questions that can be thought to measure the same dimension. You can read more about the data and the variables here. Here we'll combine multiple questions into combination variables. Useful functions for summation with data frames in R are

function	description
`colSums(df)`	returns a sum of each column in `df`
`rowSums(df)`	returns a sum of each row in `df`
`colMeans(df)`	returns the mean of each column in `df`
`rowMeans(df)`	return the mean of each row in `df`

We'll combine the use of rowMeans()with the select() function from the dplyr library to average the answers of selected questions. See how it is done from the example codes.

Access the dplyr library
Execute the example codes to create the combination variables 'deep' and 'surf' as columns in lrn14
Select the columns related to strategic learning from lrn14
Create the combination variable 'stra' as a column in lrn14

Exercise

Combining variables

Instructions

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Instructions

Exercise