Download PDQ Statistics, Third Edition (PDQ Series) by Geoffrey R. Norman PDF

By Geoffrey R. Norman

PDQ data, 3rd version deals knowledgeable assessment of all significant statistical tools, giving the reader a radical realizing of records and the way they're utilized in learn articles. The ebook covers the main different types variable and descriptive information, parametric facts, non-parametric data, and multivariate statistics. the reasons are transparent, succinct, and loaded with sensible examples. This 3rd version comprises new chapters on hierarchical and logistic regression, direction research, and structural equation modeling. PDQ information, 3rd variation additionally is helping the reader determine these statistical analyses with simple flaws in layout or examine. The ebook s appealing layout and funny writing variety make the subject material obtainable and fascinating.

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Additional resources for PDQ Statistics, Third Edition (PDQ Series)

Example text

What is the likelihood that if you repeated the experiment exactly as before, you would come to the same conclusion and reject the null hypothesis? Most people say 95%. 00 going to anyone who gets the answer. 00. 05 level, the chance of replicating the experiment is 50%! To see why, look at Figure 3-7. 50. A very astute reader challenged us on this point just before this edition came out. He pointed out that we are assuming, in our logic, that H1 is correct. But there is still a chance that H0 is correct.

P. Detector IV-1 To conclude that a difference between two groups or a difference within a group is due to some variable requires that the two samples differ only in the independent variable and in none other. Example 4-2 Bennett and colleagues1 used a randomized trial to improve students’ knowledge of critical appraisal in two areas: diagnosis and therapeutics. They administered a pretest and a posttest in each area to the treatment group (which received training in critical appraisal) and to the control group (which did not).

One final trick. The area of the H1 curve to the right of the critical value is the likelihood of declaring that there is a difference (rejecting H0) when there really is. This value, (1 – β), is called the power of the test. Among other things, power is directly (though not linearly) related to the sample size. This is so because as the sample size increases, the standard error decreases, so the two curves overlap less and the power goes up. Power is an important concept when you’ve done an experiment and have failed to show a difference.

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