It is common that data from International Large-Scale Assessments (ILSA), like TIMSS, TIMSS Advanced, PIRLS, ICCS, ICILS, CIVED, REDS, RLII, and SITES, come in an unaggregated format.

That means that data is published in hundreds of files, each of one represents a combination of countries and participants (students, teachers, principals, etc.)

It is also common that researches would need to merge this data to include all countries into a single file.

The goal of ILSAmerge is to make this process as simple and as straightforward as possible.

You can install the stable version of ILSAmerge directly from CRAN:

install.packages("ILSAmerge")

Or, if you wish to install the development version of ILSAmerge:

remotes::install_github("dopatendo/ILSAmerge")

For downloading ILSA data, we can use ILSAdownload(). For an example see vignette("Download").

For identifying populations within a study, we can use ILSAfiles.info(). For an example see vignette("IndentifyILSAfiles").

If we need to load or prepare ILSA data, we can use justload(), readILSA(), and untibble(). For an example see vignette("Load").

For merging ILSA data, we can use ILSAmerge(). For an example see vignette("Merge").

For rename ILSA data, we can use ILSArename(). For an example see vignette("Rename").

We can also combine all the steps for preparing ILSA data (downloading, merging, combining respondents, and renaming) using ILSAready().