| Abstract: | The survey methodology literature has debated whether advanceletters to potential survey respondents will reduce nonresponsebias and thereby improve the accuracy of preelection forecasts.This research note analyzes the results of experiments conductedin Maryland, New York, and Pennsylvania in which advance letterswere sent to a random sample of potential survey respondentsto 2002 preelection surveys. We find a significant increasein the overall response rate, although notably less than inpast studies. However, the advance letters did not improve therepresentativeness of survey respondents or the accuracy ofthe election forecasts. |
