Calculates mean of variable

Description

Calculates the mean of an observed variable (NOT one with plausible values) and its standard error.

Usage

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pisa.mean(variable, by, data, export = FALSE, 
name = "output", folder = getwd())

Arguments

variable

The label corresponding to the observed variable, for example, ""ESCS"", for the student SES.

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 PISA.

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.

Value

pisa.mean returns a data frame with means and standard errors.

See Also

timss.mean, pirls.mean, piaac.mean

Examples

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## Not run: 
# PISA 2012: Table II.2.3, p. 183
pisa.mean(variable="ESCS", by="IDCNTRYL", data=pisa)
pisa.mean(variable="PARED", by="IDCNTRYL", data=pisa)

# PISA 2012: Table III.2.3d, p. 252
pisa.mean(variable="BELONG", by="IDCNTRYL", data=pisa)
pisa.mean(variable="BELONG", by=c("IDCNTRYL", "ST04Q01"), data=pisa)

## End(Not run)

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