Several questions on Outgoing Rotation Group data

I need to use the Outgoing Rotation Group data in order to analyze union membership.

I am doing online analysis (SDA).

From another question I found that it is necessary to use the following filters to extract the ORG data:

age(15+)

empstat(10-12)

classwkr(20-28)

mish(4,8)

Is this correct, and is it the only way to identify persons in the ORG?

Is the data base any different for the onlline analysis than if I were to do a data extract for, say, 2017?

Does the 2017 data base I access using the online analysis contain all the months for that year?

Also what is the difference in the data base available in IPUMS and using the Merged Outgoing Rotation Group data extracted by NBER?

Put another way: What does NBER MORG give me that I can’t get from IPUMS-CPS?

Does it give me more ORG data? Does it give me more variables?

I’ll try to address each of your questions individually:

The universe for the outgoing rotation group questions is exactly as you have noted: only civilians age 15 and older who are currently employed as a wage or salaried worker (not self-employed) and who are in month-in-sample 4 or 8. This page provides some very helpful notes about the outgoing rotation group/earner study.

The data in the online analysis tool (SDA) may vary slightly from that in IPUMS CPS. There may be some variables available in IPUMS CPS that are not available in SDA. Additionally, updates to the data that are immediately available through IPUMS CPS may not immediately be available through SDA. However, we keep a list of revisions here. Most significantly, and this also addresses your next question, SDA only has data from the March CPS ASEC samples, whereas you can download data from each month, as well as supplement topics, through IPUMS CPS.

As for the difference(s) between what is available through IPUMS CPS and NBER in relation to the outgoing rotation group: NBER releases data as merged outgoing rotation groups. That is, the outgoing rotation group households, which typically comprise a fourth of every basic monthly sample for a calendar year, are extracted and merged together. As such, NBER has one file per year. More information about the NBER MORG files, including the available variables, can be found here.