piaac.mean.pv: Calculates mean achievement score for PIAAC data
In dickli/intsvy2: International Assessment Data Manager 2

Description Usage Arguments Value See Also Examples

piaac.mean.pv uses ten plausible values to calculate the mean achievement score and its standard error

1	piaac.mean.pv(pvlabel, by, data, export = FALSE, name = "output", folder = getwd())

`pvlabel`	The label corresponding to the achievement variable, for example, "LIT", for overall literacy performance, "NUM" for numeracy, "PSL" for problem solving.
`by`	The label for the grouping variable, usually the countries (i.e., by="CNTRYID"), but could be any other categorical variable.
`data`	An R object, normally a data frame, containing the data from PIAAC.
`export`	A logical value. If TRUE, the output is exported to a file in comma-separated value format (.csv) that can be opened from LibreOffice or Excel.
`name`	The name of the exported file.
`folder`	The folder where the exported file is located.

piaac.mean.pv returns a data frame with the mean values and standard errors.

pisa.mean.pv, timss.mean.pv, pirls.mean.pv

## Not run: 
# install pbiecek/PIAAC package from github to have access to piaac data
piaac.mean.pv(pvlabel = "LIT", by = "CNTRYID", data = piaac)
piaac.mean.pv(pvlabel = "NUM", by=c("CNTRYID", "GENDER_R"), data=piaac)

## End(Not run)