mean difference

1. Comparing the mean of two tests within subjects with different scores

Hi, I need to analyse these data in which I basically have the same subjects doing -the first half of the test in condition A with a score from 0 to 3 -the second half of the test in condition B with a score from 0 to 12. I cannot make them equal because the second scoring system allows a...
2. Transforming mean difference to Cohen´s d in a meta-analysis

I wish to transform the MD to standardized MD. For pregabalin the mean difference is -33.14. As far as I understand one way to achieve the above is to calculate the pooled SD using the 95% confidence interval estimate(s). SD = (-53.98-(-33.14))/1.96*sqrt(235+151) = 208.898 Hence, the Cohen´s...
3. Probability of observing mean difference/compute ranksum

Hi everyone, would appreciate some help on these three questions. If possible with calculations so that I can understand more easily! Suppose the endowment effect experiment were run with 5 people, 3 sellers and 2 buyers. Subjects arrive in the lab and pick numbers 1-5 out of the hat. If they...
4. ANOVA for three different time periods

I have three different time periods of sales data of 4 weeks apiece: weeks 1-4, 5-8, and 9-12. During weeks, 9-12 we attempted a test that may have affected sales. Can I compare weeks 1-4, 5-8, and 9-12 with ANOVA to determine whether or not they have significantly different means? I...
5. Negative Confidence Interval

3. In two wards for elderly women in a nursing home the following levels of hemoglobin were found: Ward A: 12.2, 11.1, 14.0, 11.3, 10.8, 12.5, 12.2, 11.9, 13.6, 12.7, 13.4, 13.7 grams/dl Ward B: 11.9, 10.7, 12.3, 13.9, 11.1, 11.2, 13.3, 11.4, 12.0, 11.1 g/dl Ward A Ward B n = 12 n =...
6. Definition of absolute mean difference (application to Gini coefficient)

Hello everyone, This is my first post at the forum. I've tried to find the answer but I couldn't (which may only mean that my searching abilities are rather poor). I'd need to use the "absolute mean difference" of a vector of N values, which I then need to compute the Gini coefficient of the...