Description Usage Arguments Value See Also Examples
Calculates percentiles for plausible values
| 1 2 | 
| pvlabel | The label corresponding to the achievement variable, for example, "ASRREA", for overall reading performance. | 
| per | User-defined percentiles (e.g., per = c(5, 10, 25, 75, 90, 95)). | 
| by | The label of the categorical grouping variable (e.g., by="IDCNTRYL") or variables (e.g., by=c("IDCNTRYL", "ITSEX")). | 
| data | An R object, normally a data frame, containing the data from PIRLS. | 
| 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. | 
pirls.per.pv returns a data frame with percentiles and associated standard errors. Default weights (e.g. "TOTWGT" in TIMSS) and percentiles are specified in the config parameter.
pisa.per.pv, timss.per.pv
| 1 2 3 4 5 |   ## Not run: 
    # Appendix F.1, p. 286, PIRLS 2011 International Results in Reading
    pirls.per.pv(pvlabel="ASRREA", per = c(5, 10, 25, 50, 75, 90, 95), by="IDCNTRYL", data=pirls)
  
## End(Not run)
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