|Public Library Benefits Valuation Study
Appendix D - Phoenix Public Library Research
Cost Benefit Study
In April 1999, Phoenix Public Library was the first site interviewed in the initial survey for the IMLS study. Unfortunately the numbers of responses for educators and business users were insufficient for valid statistical analysis. Also the overall response rate was only 17%, raising the question of possible response bias. For those reasons, results for Phoenix were not reported at ALA pre-conference workshop in July 2000.
Because the numbers of educator and business respondents to the initial survey were inadequate and to insure an accurate estimate of the size of the total users population, a second telephone survey of Phoenix Public Library users was administered in fall, 2000. 86 business users and 31 teachers responded to the second survey. Households (general users) were not surveyed. In calculating benefit estimates, household responses from the first survey were weighted by the distribution of users by library branch to correct for any possible response bias. Weighting the data changed the initial results minimally, suggesting that response bias was not a significant problem in the general user survey.
At the request of Phoenix Public Library, the project consultant visited Phoenix in April, 2001, and presented the results of the Phoenix study to members of the Phoenix City Council and to the Library's Advisory Board. This appendix contains the Executive Summary from Phoenix Library report and copies of the slides from the presentation. (not available in electronic format)
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