It is common that ILSA files come an unaggregated format, i.e.,
separated by country. If that is the case ILSAmerge() is
able to identify which files should be merged together.
If we want know how many files were downloaded and into which many
files they can be merged, we can use ILSAfile.info()
targeting the folder with the unzipped data:
ILSAfile.info(inputdir = system.file("extdata/reds", package = "ILSAmerge"))
## Population Files MB
## 1 BCGV1 4 0.3
## 2 BSGV1 4 0.4
## 3 BTGV1 4 0.3As we can see, for ‘REDS’ 2021 we have 3 file ‘types’ or populations:
BCGV1 (schools), BSGV1 (students), and
BTGV1 (teachers). This will become important when we need
to work with only one population.