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101.
102.
Marvin D Troutt 《Statistics》2013,47(3):463-466
This paper obtains a theorem about the density of the density ordinate when the latter is regarded as a random variable in its own right. The theorem is used to provide an alternative interpretation of the BOX-MULLER simulation method which extends also to an alternative method for simulating from the LAPLACE density 相似文献
103.
Intermediate clinical events,surrogate markers and survival 总被引:1,自引:0,他引:1
This paper investigates one- and two-sample problems comparing survival times when an individual may experience an intermediate event prior to death or reaching some well defined endpoint. The intermediate event may be polychotomous. Patients experiencing the intermediate event may have an altered survival distribution after the intermediate event. Score tests are derived for testing if the occurrence of the intermediate event actually alters survival. These models have implications for evaluating therapies without randomization as well as strengthening the log rank test for comparing two survival distributions. The exact distribution of the score tests can be found by conditioning on both the waiting time and occurrence of the intermedate event.Deceased 相似文献
104.
Marvin H. Kosters 《Journal of Labor Research》1995,16(3):263-274
The wage data presented herein were assembled by Deirdre McCullough, research assistant at the American Enterprise Institute. 相似文献
105.
The psychological response to involuntary unemployment in men and women is discussed within a developmental systems model adapted from Ketz de Vries. The response to work loss is seen as a complex and multifaceted response to a specific critical event which is affected by concurrent and previous strings of critical events and role transitions and the overall constellation of psychosocial and sociocultural influences on the adaptation of men and women. Gaps in the research evidence are pointed out and directions for future research are suggested. 相似文献
106.
We establish general conditions for the asymptotic validity of single-stage multiple-comparison procedures (MCPs) under the following general framework. There is a finite number of independent alternatives to compare, where each alternative can represent, e.g., a population, treatment, system or stochastic process. Associated with each alternative is an unknown parameter to be estimated, and the goal is to compare the alternatives in terms of the parameters. We establish the MCPs’ asymptotic validity, which occurs as the sample size of each alternative grows large, under two assumptions. First, for each alternative, the estimator of its parameter satisfies a central limit theorem (CLT). Second, we have a consistent estimator of the variance parameter appearing in the CLT. Our framework encompasses comparing means (or other moments) of independent (not necessarily normal) populations, functions of means, quantiles, steady-state means of stochastic processes, and optimal solutions of stochastic approximation by the Kiefer–Wolfowitz algorithm. The MCPs we consider are multiple comparisons with the best, all pairwise comparisons, all contrasts, and all linear combinations, and they allow for unknown and unequal variance parameters and unequal sample sizes across alternatives. 相似文献
107.
The nature and frequency of men's and women's sexual fantasies were investigated by surveying 307 students (182 females, 125 males) at a California state university or junior college via a paper‐and‐pencil questionnaire. The questionnnaire was inspired by modern evolutionary theory and was designed to investigate sex differences in sexual fantasies. Substantial sex differences were found in the salience of visual images, touching, context, personalization, emotion, partner variety, partner response, fantasizer response, and inward versus outward focus. These data, the scientific literature on sexual fantasy, the historically‐stable contrasts between male‐oriented pornography and female‐oriented romance novels, the ethnographic record of human sexuality, and the ineluctable implications of an evolutionary perspective on our species, taken together, imply the existence of profound sex differences in sexual psychologies. 相似文献
108.
The Gauss-Markov (GM) theorem and its many consequences are well known. It has been our experience that graduate students in linear model courses benefit substantially by deriving these consequences, all of which form natural corollaries to the GM theorem. In deriving any one lemma, the student is compelled to reuse many other GM-based lemmas. In this article we present another example of such a lemma that arises in the forward-elimination variable selection procedure. The derivation given is considered to be pedagogically useful. 相似文献
109.
Marvin D. Troutt 《Theory and Decision》1991,30(2):95-107
By personal inventory decisions we mean the decisions on quantity purchased which are made daily in such activities as grocery shopping. This topic has previously been introduced only at the conceptual level. Hence our main purpose is to provide a quantitative discussion. Some specific models are pursued to solution. Surprisingly, a conjoint value function aggregator leads to indifference in replenishment quantity. Contrasts to the EOQ assumptions are highlighted. 相似文献
110.
An economic model of teenage pregnancy decision-making 总被引:4,自引:2,他引:2
In this paper, we model unmarried teenagers' decisions about their pregnancy outcome by considering that the teenager contrasts her expected utility (1) as a married mother, (2) as an unmarried mother, or (3) after abortion. We use cross-sectional data on 297 California teenagers aged 13-19 who were pregnant for the first time between 1972 and 1974. Both Anglo and Mexican-American girls are included. We find that pregnant girls who are eligible for or are receiving public assistance are more likely to give birth and remain unmarried. Teenagers with greater time values are more likely to choose abortion, and Mexican-American girls are more likely to carry their pregnancies to term. 相似文献