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31.
Advance letters are being used increasingly to combat the declinein response rates, but their effectiveness depends partly ontheir being read. In the face of the post-9/11 anthrax mailingscare, the Office for Survey Research (OSR) converted to usingadvance postcards rather than advance letters. Subsequently,the OSR conducted an experiment to test the effectiveness ofsending letters, postcards, or nothing to directory-listed numbersselected in a large random digit dial (RDD) telephone survey.In terms of response rates, the results clearly indicate thatsending advance letters is more effective than sending postcards,which, in turn, is more effective than sending nothing. A detailedcost-effectiveness evaluation indicates that sending lettersactually saves money, despite the increased costs associatedwith the mailings, compared to sending postcards; sending postcardsis also more cost-effective than not sending anything.  相似文献   
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It was proved in Cohn (1982) that for any finite offspring mean, supercritical Bellman-Harris process {Z(t)} there exist some norming constants {C(t)} such that {Z(t)/C(t)} converges almost surely to a non-degenerate random variable W. {C(t)} were defined to be the μ-quantiles of {Z(t)}. Schuh (1982) has given an alternative proof of this result, identifying C(t) as “the Seneta constants” 1/(-log Ft(-1)(γ)), where F1(γ) = E(γZ(t)). Both proofs are long and complicated. It will be shown here that a much simpler proof can be devised from Cohn (1982), if use is made of an elementarily proved property given in Schuh (1982).  相似文献   
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This article focuses on gay male couples as they exist within friendship networks of other gay men. By comparing homosexual men who are part of a gay community with those who are less integrated into a gay community, we attempt to show that the sexual liaisons of the former are more “marriage-like.” Gays committed to a community of other homosexual men were found to live more often with their lovers, be more sexually faithful to their lovers, and to have more emotionally intimate relationships. Also, they were found more likely to associate with other gay couples. Commitment to a gay community was not found to be associated with length of a liaison, and it seemed that when respondents defined emotional intimacy in terms of sexual exclusiveness there may have been a tendency for disruption of relationships. The gay community validates the sexual liaisons of gay men in the same way that the heterosexual world validates the pairings of heterosexuals and transforms their subinstitutional sexual liaisons into the institution of marriage.  相似文献   
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The 1970 census included numerous procedural innovations, of which the most important was the use of mail-out/mail-back techniques. A statewide survey of Wisconsin households (conducted in May and June, 1970) included questions designed to elicit information on the degree of cooperation rendered, ease of comprehension of the form, possible objectionable items on the census, whether or not contacts were made by enumerators, and respondent judgments of the adequacy of enumerators’ performance. The results indicate that Wisconsin respondents tended to comply with census procedures, that they found very little difficulty in filling out the mailed forms, and that they regarded the census enumerators as doing a “good job” in most cases.  相似文献   
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