SIPP, along with many other household surveys, has experienced declining response rates which increases standard errors around estimates as well as weights for characteristics. For more information regarding the quality of the SIPP data, please visit the SIPP Source and Accuracy Statements website which provides detailed information on sampling, weighting, nonresponse, and standard error calculations for each file. For a summary of the data collection activities starting with the 2018 SIPP Panel, please refer to Figure 1-2 in the 2025 SIPP Users’ Guide.