What does the detailed code 000 “NA or no schooling” mean? We already have 001 for “NA” and 002 for “No schooling completed”. I checked my sample and found the number of observations with Educd=000 is 0 while the numbers with eudcd=001 and educd=002 are large but not equal numbers.
Besides, does the combination of educd=000, educd=001, and educd=002 (detailed codes) equal to educ=00 (general code)?
If I want to drop out all the observations that do not have a valid schooling years/ have no schooling completed, which criterion(criteria) should I use?
Here is link for the table where it occurs.https://usa.ipums.org/usa-action/variables/educ#codes_section
Thank you very much!