[Letter from Campbell B. Read to Station Manager of KVTT-FM 91.7, "Request for Equal Time" - May 14, 1983]

[Letter from Campbell B. Read to Station Manager of KVTT-FM 91.7, "Request for Equal Time" - May 14, 1983]

Date: May 14, 1983
Creator: Read, Campbell B.
Description: Letter from Campbell B. Read, Ph.D. to the Station Manager of the Christian radio station KVTT 91.7 FM in Dallas. Dr. Read is requesting equal time to respond to certain claims made by Dr. Paul Cameron, Dr. Clem Mueller, and a vice officer of the Dallas Police Department on the "Point of View" talk radio program on May 13, 1983. The topic of the talk show was the health aspects of homosexual behavior. Read writes that the Federal Communications Commission requires that radio stations give equal time for rebuttal if "questionable, if not slanderous, statements are made about [minority] groups". Read, who holds a Ph. D. in Statistics, challenges the claims made by the guests on the talk show and claims that their comments about the gay community were indeed slanderous.
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U.S. Census Bureau: The 2011 Statistical Abstract

U.S. Census Bureau: The 2011 Statistical Abstract

Date: January 2011
Creator: United States. Bureau of the Census.
Description: This website contains the social, political, and economic statistical summaries for the United States, compiled from the Census Bureau, Bureau of Labor Statistics, Bureau of Economic Analysis, as well as other federal agencies and private organizations.
Contributing Partner: UNT Libraries Government Documents Department
The Generalization of the Logistic Discriminant Function Analysis and Mantel Score Test Procedures to Detection of Differential Testlet Functioning

The Generalization of the Logistic Discriminant Function Analysis and Mantel Score Test Procedures to Detection of Differential Testlet Functioning

Date: August 1994
Creator: Kinard, Mary E.
Description: Two procedures for detection of differential item functioning (DIF) for polytomous items were generalized to detection of differential testlet functioning (DTLF). The methods compared were the logistic discriminant function analysis procedure for uniform and non-uniform DTLF (LDFA-U and LDFA-N), and the Mantel score test procedure. Further analysis included comparison of results of DTLF analysis using the Mantel procedure with DIF analysis of individual testlet items using the Mantel-Haenszel (MH) procedure. Over 600 chi-squares were analyzed and compared for rejection of null hypotheses. Samples of 500, 1,000, and 2,000 were drawn by gender subgroups from the NELS:88 data set, which contains demographic and test data from over 25,000 eighth graders. Three types of testlets (totalling 29) from the NELS:88 test were analyzed for DTLF. The first type, the common passage testlet, followed the conventional testlet definition: items grouped together by a common reading passage, figure, or graph. The other two types were based upon common content and common process. as outlined in the NELS test specification.
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The Fixed v. Variable Sampling Interval Shewhart X-Bar Control Chart in the Presence of Positively Autocorrelated Data

The Fixed v. Variable Sampling Interval Shewhart X-Bar Control Chart in the Presence of Positively Autocorrelated Data

Date: May 1993
Creator: Harvey, Martha M. (Martha Mattern)
Description: This study uses simulation to examine differences between fixed sampling interval (FSI) and variable sampling interval (VSI) Shewhart X-bar control charts for processes that produce positively autocorrelated data. The influence of sample size (1 and 5), autocorrelation parameter, shift in process mean, and length of time between samples is investigated by comparing average time (ATS) and average number of samples (ANSS) to produce an out of control signal for FSI and VSI Shewhart X-bar charts. These comparisons are conducted in two ways: control chart limits pre-set at ±3σ_x / √n and limits computed from the sampling process. Proper interpretation of the Shewhart X-bar chart requires the assumption that observations are statistically independent; however, process data are often autocorrelated over time. Results of this study indicate that increasing the time between samples decreases the effect of positive autocorrelation between samples. Thus, with sufficient time between samples the assumption of independence is essentially not violated. Samples of size 5 produce a faster signal than samples of size 1 with both the FSI and VSI Shewhart X-bar chart when positive autocorrelation is present. However, samples of size 5 require the same time when the data are independent, indicating that this effect is a ...
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