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ERIC Number: ED469645
Record Type: Non-Journal
Publication Date: 2002-Mar
Pages: 59
Abstractor: N/A
Reference Count: N/A
National Postsecondary Student Aid Study 1999-2000 (NPSAS:2000), CATI Nonresponse Bias Analysis Report. Working Paper Series.
Siegel, Peter H.; Whitmore, Roy W.; Johnson, Ruby E.; Yu, Di
Unit nonresponse causes bias in survey estimates when the outcomes of respondents and nonrespondents are different. In the National Postsecondary Student Aid Study of 1999-2000 (NPSAS:2000) there were three levels of response, one of which was computer-assisted telephone interview (CATI) response. Because the response rates were less than 70% in some sectors or overall, an analysis was conducted to determine if CATI estimates were significantly biased due to CATI nonresponse. Through other databases, considerable information was available about CATI nonrespondents to this survey, and these data were used to analyze and reduce bias. The distribution of several variables using the design-based, adjusted weights for study respondents were found to be biased before CATI nonresponse adjustments. The CATI nonresponse and poststratification procedures, however, reduced the bias for these variables, and when the weighting was completed, no variables available for most respondent and nonrespondents had significant bias for all students combined. The bias was significantly reduced, and the remaining bias is small. Section 2 discusses the characterization of the bias before CATI nonresponse adjustment, and section 3 describes the weight adjustments used to reduce bias. Section 4 describes the bias for CATI variables, and section 5 discusses the bias remaining after weight adjustments. Section 6 discusses the overall predictive ability of the three nonresponse models, and section 7 presents conclusions. (SLD)
For full text:
Publication Type: Reports - Evaluative
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: National Center for Education Statistics (ED), Washington, DC.