Including a control for who took the Learning Module in Column 2 indicates those who answered the survey contributed around 1 percentage point more of their pay, for an improvement of 12% compared to their nonrespondent
counterparts (other coefficients are unaffected by including this additional variable).
Additionally, no differences were found between respondents and the nonrespondent
group across the four demographic items included in the shortened survey (gender, age, zip code, and education).
Data from websites of companies that did not respond to the survey on reduction of trans-fatty acids, Latin America and the Caribbean, 2009 Nonrespondent
company Relevant quote on trans-fatty acids (company Internet address) Watt's S.
Annual refinery receipts of domestic and foreign crude oil for a nonrespondent
are imputed by aggregating the values for the refinery on the monthly survey.
2) Based on information on nonrespondent
graduates that we obtained from their dissertation advisors (whom we assumed were a representative set of the nonrespondents
' advisors), only 31% of nonrespondents
The nonresponse bias can also be expressed in terms of the response rate and the difference in the respondent and nonrespondent
TABLE 2 Background Characteristics Respondents and NonRespondents
Mean of Respondent Mean of Nonrespondent
Characteristic/Variable Group (n = 478)*** Group (n = 990) AGETRACT age of household 36.
Five patients were positive for HIV, and the median number of sex partners during the 90 days preceding diagnosis was three (range: two to 100 partners; one nonrespondent
among the eight patients who provided such information).
The second set of phone calls to nonrespondent
agency chiefs (N = 35) questioned them about the influence of governors and legislatures concerning their attitudes towards reinvention.
0 (1) One nonrespondent
, (2) 6 nonrespondents
, (3) 3 nonrespondents
, (4) 27 nonrespondents
Table 1 presents Compustat-based descriptive statistics that compare survey to nonsurvey firms (Panel A) and respondent to nonrespondent
firms (Panel B).
If after these attempts a completed interview was not achieved, a final disposition code of nonrespondent