Survey nonresponse has the potential to introduce bias in the estimates of key outcomes. To the extent that nonrespondents and respondents differ on observed characteristics, the Office of People Analytics (OPA) can use weights to adjust the sample so the weighted respondents match the full population on the most critical characteristics. This eliminates the portion of nonresponse bias (NRB) associated with those observed variables if these variables are strongly associated with the behaviors. OPA investigated the presence of NRB using many different methods, and are summarized in this report as follows: 1. Comparison of known population values with weighted survey estimates, 2. Analysis of OPA’s survey of nonrespondents, and 3. Evaluating the sensitivity of different post-survey adjustments (weighting methods) on survey estimates. From this analysis, OPA concludes that is little evidence of NRB in sexual assault estimates from the 2012 WGRA.