XII--The t tests (concluded).

the washback effect of discretepoint vs. integrative tests on the retention of content in knowledge tests

در این پایان نامه تاثیر دو نوع تست جزیی نگر و کلی نگر بر به یادسپاری محتوا ارزیابی شده که نتایج نشان دهندهکارایی تستهای کلی نگر بیشتر از سایر آزمونها است

Research Projects - concluded

Lay Abstract Identify causal biological mechanisms of PTSD using a novel gene x environment mouse model of stress vulnerability, and characterize the interaction between PTSD-like symptoms and nicotine/alcohol consumption Identify SNPs associated with PTSD, or PTSD and comorbid substance use disorders, informed by our mouse model. Examine the genetics and epidemiology of substance abuse among m...

Statistics at square one. XX-Correlation (concluded).

t-tests and p-values

We have discussed how to handle this test when σ is known. But how should we proceed if it is unknown? One option is the GLRT, discussed above. However, (a) we must estimate μ and (b) Wilk’s theorem only tells us that the test statistic corresponding to maximum likelihood estimates of σ and μ is asymptotically chi-squared. For small n, then, it can be difficult to set a threshold to achieve a d...

Efficient three-stage t-tests

Three-stage t-tests of separated one-sided hypotheses are derived, extending Lorden’s optimal three-stage tests for the one-dimensional exponential family by using Lai and Zhang’s generalization of Schwarz’s optimal fully-sequential tests to the multiparameter exponential family. The resulting three-stage t-tests are shown to be asymptotically optimal, achieving the same average sample size as ...