timss.mean.pv: Calculates mean achievement score
In dickli/intsvy2: International Assessment Data Manager 2

Description Usage Arguments Value See Also Examples

timss.mean.pv uses five plausible values to calculate the mean achievement score and its standard error

timss.mean.pv(pvlabel = "BSMMAT", by, data, 
export = FALSE, name = "output", folder = getwd())
timss2015.mean.pv(pvlabel = "BSMMAT", by, data, 
export = FALSE, name = "output", folder = getwd())

`pvlabel`	The label corresponding to the achievement variable, for example, "BSMMAT", for overall math performance in Grade 8.
`by`	The label for the grouping variable, usually the countries (i.e., by="IDCNTRYL"), but could be any other categorical variable.
`data`	An R object, normally a data frame, containing the data from TIMSS.
`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.

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

pirls.mean.pv, pisa.mean.pv

## Not run: 
# TIMSS G4: Exhibit 1.1 International report TIMSS, p. 40
timss.mean.pv(pvlabel="ASMMAT", by= "IDCNTRYL", data=timss4g)

# TIMSS G8: Exhibit 2.8 User Guide TIMSS 2011, p. 18
timss.mean.pv(pvlabel="BSMMAT", by= c("IDCNTRYL", "ITSEX"), data=timss8g)

## End(Not run)