sjmisc: Data and Variable Transformation Functions

General

• Reduce package dependencies.

New functions

• de_mean() to compute group-meaned and de-meaned variables.
• add_variables() and add_case() to add columns or rows in a convenient way to a data frame.
• move_columns() to move one or more columns to another position in a data frame.
• is_num_chr() to check whether a character vector has only numeric strings.
• seq_col() and seq_row() as convenient wrapper to create a regular sequence for column or row numbers.

Changes to functions

• descr() gets a weights-argument, to print weighted descriptive statistics.
• The n-argument in row_means() and row_sums() now also may be Inf, to compute means or sums only if all values in a row are valid (i.e. non-missing).
• Argument weight.by in frq() was renamed into weights.
• frq() gets a title-argument, to specify an alternative title to the variable label.

Bug fixes

• round_num() preserves data frame attributes.
• frq() printed frequencies of grouping-variable for grouped data frames, when weights was not NULL.
• Fixed issue with wrong title in frq() for grouped data frames, when grouping variable was an unlabelled factor.