Description Usage Arguments Value See Also Examples
intsvy.rho produces a correlation matrix for observed variables (NOT for plausible values)
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| variables | Data labels for the variables in the correlation matrix (e.g., variables=c("ASRREA01", "ASDAGE") ) | 
| 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 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. | 
| config | Object with configuration of a given study. Should contain the slot 'prefixes' with prefixes of filenames with the student, home, school, and teacher data. | 
intsvy.rho returns a matrix including correlation and standard error values.
timss.rho, pirls.rho.pv, timss.rho.pv
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