![[Experimental]](figures/lifecycle-experimental.svg)
Arguments
- data
A dataframe.
- cols
A tidy selection of item columns.
- newcol
Name of the index as a character value. Set to NULL (default) to automatically build a name from the common column prefix, prefixed with "idx_".
- clean
Prepare data by data_clean.
Value
The input tibble with an additional column that contains the index values. The column contains the result of the alpha calculation in the attribute named "psych.alpha".
Examples
ds <- volker::chatgpt
volker::add_index(ds, starts_with("cg_adoption"))
#> # A tibble: 97 × 20
#> case use_private use_work cg_adoption_advantage_01 cg_adoption_advantage_02
#> <dbl> <dbl> <dbl> <dbl> <dbl>
#> 1 170 4 4 3 4
#> 2 183 1 1 4 3
#> 3 195 2 4 5 5
#> 4 212 5 5 4 4
#> 5 222 2 3 3 2
#> 6 236 3 1 3 2
#> 7 255 3 1 3 1
#> 8 297 3 4 4 3
#> 9 309 3 3 3 4
#> 10 325 2 1 4 1
#> # ℹ 87 more rows
#> # ℹ 15 more variables: cg_adoption_advantage_03 <dbl>,
#> # cg_adoption_advantage_04 <dbl>, cg_adoption_fearofuse_01 <dbl>,
#> # cg_adoption_fearofuse_02 <dbl>, cg_adoption_fearofuse_03 <dbl>,
#> # cg_adoption_fearofuse_04 <dbl>, cg_adoption_social_01 <dbl>,
#> # cg_adoption_social_02 <dbl>, cg_adoption_social_03 <dbl>,
#> # cg_adoption_social_04 <dbl>, adopter <fct>, sd_age <dbl>, …