An addendum to the 2018 NAMCS public use data file documentation is now available, along with a SAS data set containing a refined version of the patient visit weight and the physician weight. The addendum includes a program to merge the new variables to the existing 2018 NAMCS public use data file. The refined weighting variables reflect changes made to the weighting methodology used with the 2019 NAMCS. They are being provided should researchers wish to use the same methodology for both survey years. See the addendum for more information. (11/2022)
A visit-level file based on 2020 NAMCS Community Health Center data is available for use in the NCHS Research Data Center (RDC). Please see the RDC file data dictionary [PDF – 684 KB], visit the RDC website, or contact the Ambulatory and Hospital Care Statistics Branch at email@example.com or 301-458-4600 for more information.
A new version of the 2019 NHAMCS Emergency Department public use data file was released which includes the ED weight variable (EDWT) only on the first record for each hospital (based on the HOSPCODE variable). The initial file release included this variable on all ED records. It is easier to produce facility-level estimates when the EDWT variable is present on only one record for each ED, and that is the way the file has traditionally been released. To calculate facility-level estimates correctly, it is recommended that the revised version of the file be downloaded. Visit-level estimates are unaffected. Pre-made SAS, SPSS, and Stata datasets have also been updated to reflect this change (2/2022)
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