Status:Closed    Asked:Sep 13, 2013 - 04:59 PM

It it okay to combine the six 1% samples of the 1970 US Census into a 6% sample?

The MPC provides six samples from the 1970 US Census (1% metro fm1, 1% metro fm2, 1% state fm1, 1% state fm2, 1% neigh fm1, and 1% neigh fm2).

Can I combine the six sample to obtain a 6% sample? - Assuming that I divide the sample weight by 6 (e.g., new_weight = perwt/6).

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Staff Answer

Within each form, the three samples were selected by an independent random draw with replacement. As a result, some cases could appear on both the Metro Form 1 and the State Form 1, for example. Some researchers choose to disregard this overlap due to the small number of cases and treat a combined 6% sample as if there are no duplicates.


Sep 16, 2013 - 09:50 AM

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