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Compare groups for each item by calculating F-statistics and effect sizes

Source: R/effects.R
effect_metrics_items_grouped.Rd

The models are fitted using stats::lm. ANOVA of type II is computed for each fitted model using car::Anova. Eta Squared is calculated for each ANOVA result using effectsize::eta_squared.

Usage

effect_metrics_items_grouped(
  data,
  cols,
  cross,
  labels = TRUE,
  clean = TRUE,
  ...
)

Arguments

data

A tibble containing item measures.

cols

Tidyselect item variables (e.g. starts_with...).

cross

The column holding groups to compare.

labels

If TRUE (default) extracts labels from the attributes, see codebook.

clean

Prepare data by data_clean.

...

Placeholder to allow calling the method with unused parameters from effect_metrics.

Value

A volker tibble.

Examples

library(volker)

data <- volker::chatgpt
effect_metrics(data, starts_with("cg_adoption_"), adopter)
#> 
#> 
#> |Expectations                                                |    F|   p| stars| Eta| Eta squared|
#> |:-----------------------------------------------------------|----:|---:|-----:|---:|-----------:|
#> |ChatGPT has clear advantages compared to similar offerings. |  1.0| 0.7|      | 0.2|         0.0|
#> |Using ChatGPT brings financial benefits.                    |  2.9| 0.0|     *| 0.3|         0.1|
#> |Using ChatGPT is advantageous in many tasks.                |  0.2| 0.6|      | 0.1|         0.0|
#> |Compared to other systems, using ChatGPT is more fun.       |  1.1| 0.1|      | 0.2|         0.0|
#> |Much can go wrong when using ChatGPT.                       |  0.2| 0.5|      | 0.1|         0.0|
#> |There are legal issues with using ChatGPT.                  |  1.5| 0.2|      | 0.2|         0.0|
#> |The security of user data is not guaranteed with ChatGPT.   |  1.4| 0.1|      | 0.2|         0.0|
#> |Using ChatGPT could bring personal disadvantages.           |  1.4| 0.1|      | 0.2|         0.0|
#> |In my environment, using ChatGPT is standard.               |  9.0| 0.0|   ***| 0.5|         0.2|
#> |Almost everyone in my environment uses ChatGPT.             |  9.1| 0.0|   ***| 0.5|         0.2|
#> |Not using ChatGPT is considered being an outsider.          | 11.6| 0.0|   ***| 0.5|         0.3|
#> |Using ChatGPT brings me recognition from my environment.    | 10.1| 0.0|   ***| 0.5|         0.2|
#> 
#> 4 missing case(s) omitted.
#>