Helper function to read in data

This function builds a list of correlation matrices from data that are in flat files where a correlation matrix is coded into a single row, a common format for coding correlation matrices.

df_to_corr(data, variables, ID = NULL)

Arguments

data

Data frame input used to convert to correlation matrices.

variables

A character vector of variable names representing the columns to convert to a pairwise correlation matrix. Variable names take the following format: "columnname_rowname" where the name prior to the underscore is the column name and the name after the underscore is the row name.

ID

A variable name, as a character string, to use as names for the list elements.

Value

A list of correlation matrices.

Examples

becker09 <- read.csv(paste0(system.file('raw_data', package = 'mars'),
   '/Becker09.csv'))
becker09_list <- df_to_corr(becker09,
   variables = c('Cognitive_Performance',
                 'Somatic_Performance',
                 'Selfconfidence_Performance',
                 'Somatic_Cognitive',
                 'Selfconfidence_Cognitive',
                 'Selfconfidence_Somatic'),
    ID = 'ID')