Wednesday, April 16, 2014

CCHS 2010 PUMF vs. Master File


I have a researcher who is looking for the total number of variables and cases in the CCHS 2010 master file are. She wants to compare this to the characteristics of the PUMF to help her decide if it is worth using the master file at the RDC. Is there any way to get this information? The Nesstar site does not provide frequencies for master files (and CCHS 2010 is not among those where the metadata is available).


Your researcher can consult Nesstar for the number of variables in the PUMF versus the masterfile- however the case count information on the masterfile is considered confidential. We did recently receive new Masterfiles to be added to Nesstar, and I checked and the CCHS 2010 annual component is available. I will have the DDI coder add it as a priority. As noted in the announcement when we started adding masterfile metadata:

Through our on-line tool, NESSTAR, researchers will be able to view survey documentation, methodology and variable level information related to the Statcan masterfiles. This metadata has been stripped of all confidential information, therefore, no frequency information or case counts are available for the masterfiles on the NESSTAR. The inclusion of DDI metadata for masterfiles in Nesstar will improve the discoverability of Statistics Canada surveys. Researchers will be able to identify variables of interest on the master file to assist them with their project proposals or custom tabulation requests. DLI contacts will now be able to distinguish whether a PUMF or the master file would best fit their users’ research needs.

Alternatively, I would encourage your researcher to speak to a RDC analyst or contact Health Statistics Division for more information.