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Criminologists are often interested in examining interactive effects within a regression context. For example, “holding other relevant factors constant, is the effect of delinquent peers on one's own delinquent conduct the same for males and females?” or “is the effect of a given treatment program comparable between first-time and repeat offenders?” A frequent strategy in examining such interactive effects is to test for the difference between two regression coefficients across independent samples. That is, does b1= b2? Traditionally, criminologists have employed a t or z test for the difference between slopes in making these coefficient comparisons. While there is considerable consensus as to the appropriateness of this strategy, there has been some confusion in the criminological literature as to the correct estimator of the standard error of the difference, the standard deviation of the sampling distribution of coefficient differences, in the t or z formula. Criminologists have employed two different estimators of this standard deviation in their empirical work. In this note, we point out that one of these estimators is correct while the other is incorrect. The incorrect estimator biases one's hypothesis test in favor of rejecting the null hypothesis that b1= b2. Unfortunately, the use of this incorrect estimator of the standard error of the difference has been fairly widespread in criminology. We provide the formula for the correct statistical test and illustrate with two examples from the literature how the biased estimator can lead to incorrect conclusions. 相似文献
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DONALD RUMSFELD PAUL KENNEDY JOE NYE ZBIGNIEW BRZEZINSKI SAMUEL HUNTINGTON FRANCIS FUKUYAMA GEORGE SOROS HILLARY CLINTON BILL CLINTON JOHN POLANYI CHRIS PATTEN JAMES WOLFENSOHN GLORIA MACAPAGAL ARROYO ABDULAZIS OTHMAN ALTWAJIRI HASSAN AL‐TURABI KHALED M. AL‐ANKARY JACK VALENTI AKBAR AHMED KIM DAE JUNG EDWARD SAID JUAN GOYTISOLO ALEJANDRO TOLEDO JOSEPH STIGLITZ DESMOND TUTU 《新观察季刊》2008,25(1):18-21
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ILYA PRIGOGINE STEPHEN HAWKING PIET HUT JOHN POLANYI BILL JOY AMORY LOVINS FRANCIS FUKUYAMA JACQUES ATTALI PETER SLOTERDIJK LEON KASS JAMES WATSON IAN WILMUT CRAIG VENTER DANIEL COHEN WILLIAM HASELTINE GERALD EDELMAN DAVID BALTIMORE JOSHUA LEDERBERG NORMAN BOURLAG JIMMY CARTER PAUL BOYER DANIEL COHN‐BENDIT JAMES HANSEN MARIO MOLINA FARIDA FAOUZIA CHARFI AHMED ZEWAIL ALAIN TOURAINE MUNAWAR ANEES CZESLAW MILOSZ 《新观察季刊》2008,25(1):48-51
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In recent years, the comparative literature on presidential democracy has emphasised the role of coalitional politics in attenuating the ‘perils’ facing minority presidents. Yet since the beginning of the Third Wave of democratisation in 1974, a surprising number of minority presidents have eschewed cabinet coalitions (defined minimally as the awarding of at least one portfolio to a party other than the nominal party of the president). Unipartisan governments are observed just under half of the time. What explains the adoption of single-party cabinets by minority presidents? Cross-sectional time-series analysis is employed to address this question. Hypotheses are tested that relate to the size and distribution of the formateur (presidential) and largest non-formateur parties that make up the legislature; the nature of party linkages and ideological distance between the president and possible partisan allies; and the extent of reactive veto powers held by the president. 相似文献
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Although Agnew's (1992) general strain theory (GST) has secured a fair degree of support since its introduction, researchers have had trouble explaining why some individuals are more likely than others to react to strain with delinquency. This study uses data from the National Survey of Children to address this issue. Drawing on Agnew (1997) and the psychological research on personality traits, it is predicted that juveniles high in negative emotionality and low in constraint will be more likely to react to strain with delinquency. Data support this prediction. 相似文献
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