delete_columns: A function to delete columns from the data based on data...
In antonmalko/ibextor: Easy preprocessing of Ibex data

A function to delete columns from the data based on data and/or user requests.

1 2	delete_columns(d, del_col = NULL, del_mode = c("auto", "user", "mixed"), verbose = TRUE)

`d`	data.frame the columns of which are to be deleted
`del_col`	numeric. Vector of column numbers to be deleted.
`del_mode`	how to determine which columns have to be deleted. Can be one of: “auto” (decide based on data), “user” (only take into account user's requests), “mixed” (take into account user request and data). “auto” is used by default if "del_col" is not specified; if it is, “mixed” is used. See Details
`verbose`	logical. If `TRUE` (default), report which columns were deleted and why.

The first seven columns in IBEX results always are:

By default, the deletion mode is “auto”. It means that the function will remove columns not containing useful information. This means:

"md5 hash" column is always removed since it's not usually used in analyses
"controller" column is removed if there is just one controller in the data - it is assumed, the user will know what controller that is
"element number" column is removed if that column only contains zeros
"group" column is removed if it only contains 'NULL' values

The above applies to all controllers. In addition:

for DashedSentence and DashedAccpetabilityJudgment column 11 ("line break") is removed if it only contains FALSE values.
For DashedAcceptabilityJudgment only column 15 ("is.correct") is removed if it contains only NULL valuess (if this is the case, it means that correct answers were not specified in IBEX, so this column is of no use).

In “user” deletion mode the data will not be taken into account at all, and only the columns specified by user will be deleted.

In “mixed” deletion mode the columns to delete are the union of the sets of automatically deleted columns and user-specified columns.

data.frame 'd' with deleted columns

antonmalko/ibextor documentation built on May 25, 2019, 2:26 p.m.