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341.
342.
以无样地调查方法中的随机或随机个体法所得资料为基点,提出异地间同种生物种群空间格局异同的秩和检验法 相似文献
343.
344.
This research examines the role of scholastic ability and family background variables in the determination of educational
attainment in Denmark. A categorical representation of the highest level of education attained by the individual is the dependent
variable. It is analyzed by procedures that take account of the presence of unobservable factors. Parent’s education and occupation,
along with an indicator of scholastic ability which is represented by a set of aptitude tests, explain a small but significant
portion of the variation in their children’s educational success. Women are shown to respond differently to their environments
than men, and including these test scores does not remove the need to deal with unmeasured attributes. On the basis of the
available data, family background variables as a group contribute more to the explained variation in the data than the test
scores. Finally, credit constraints do not appear to be a factor in educational attainments.
相似文献
James McIntoshEmail: |
345.
试论执业医师资格考试的影响因素 总被引:1,自引:0,他引:1
高书杰 《辽宁医学院学报(社会科学版)》2008,6(1):23-25
我国《执业医师法》已经实施以来,由于我国的政治、经济体制不断变革,国际医学教育形势发生了深刻变化,使《执业医师法》在实施过程中遇到了一些具体问题。在分析执业医师考试影响因素的基础上,与国外执业医师考试的做法进行比较,提出对我国执业医师考试考生报考资格进行修改的建议,有利于加强我国医师队伍的规范化管理,确保医师队伍整体素质的不断优化和提高。 相似文献
346.
Martin Nordin 《Journal of population economics》2008,21(3):703-717
Using the Swedish military enlistment test, this paper estimates the return to schooling for individuals belonging to different
parts of the ability distribution. It also attempts to predict whether an endogenous test score causes bias in the “ability-specific”
returns to schooling that varies with the test score. A significant finding is that a higher score in the test is associated
with a higher return to schooling, but that the positive association is diminishing in the test score. In general, the bias
in the ability-specific returns to schooling does not seem to vary with the test score level.
相似文献
Martin NordinEmail: |
347.
348.
The exact null distribution of the likelihood ratio test statistic for testing equality of covariance matrices of q compound symmetric Gaussian models (bivariate or trivariate) has been obtained and percentage points for q ? 5 have been computed. The inverse Mellin transform and calculus of residues have been used to derive these results. 相似文献
349.
Equality of variances is one of the key assumptions of analysis of variances (ANOVA). There are several testing procedures available to validate this assumption, but it is rare to find a test procedure which controls the type I error rate while providing high statistical power. In this article, we introduce a bootstrap test based on the ratio of mean absolute deviances (RMD). We also propose a two-stage testing procedure where we first quantify the skewness of the distributions and then choose an appropriate test for homogeneity of variances. The performances of these test procedures are studied via a simulation study. 相似文献
350.