effect size

  1. LycianSage

    Effect Size measure for Ordinal Logistic Regression

    Hello friends, I am using "Ordinal Logistic Regression" for my dissertation research. I wanted to report the effect size but couldn't find definitive reference for reporting an effect size. I have found some papers stating that "Nagelkere's R square" is the effect size measure. Another states...
  2. L

    Effect size for Wilcoxon Signed Rank

    1) i want to calculate the effect size for wilcoxon signed rank (paired sample). I have one group of 10 participants. I know the formula for the effect size is Z/squaroot of N. My question is, does N refer to the numbe of participant (N=10) or should I multiply the number of participant...
  3. S

    Help interpreting a statistical symbol "Φ"

    Hello, Please excuse my ignorance - novice. I am currently reading a paper - 'Non-parametric estimators of effect size' by Larry V. Hedges and Ingram Olkin. The problem is that i can not understand this Symbol 'Φ'. Could someone please tell me what this means is statistics. Yes,I have...
  4. R

    Help with power analysis!

    So, I've never taken a statistics course before. Just completed my honors thesis and graduated. Now I'm trying to do power analysis (post hoc) on my data. Using G power, please help me with what to do/how to interpret the results. First of all, I looked at two independent groups (group 1...
  5. M

    effect sizes: generalized omega squared statistics

    hi all i read this paper http://www.psych.umn.edu/courses/spring06/federicoc/psy8815/lectures/genomegasquared.pdf and based on the following arguments: 1) very small sample size - needs unbiased estimation 2) repeated measures 3) 2 x 2 design decided on reporting the generalized...
  6. M

    Power calculation in regression for curviliear effect

    Hi! I performed a regresson analysis to test a curvilinear effect. I've followed Aiken & West procedures Center X, Squared centered X Enter X 1st step Enter X2 2nd step However, in the interpretation of the results I would like to test the power of this regression, considering the...
  7. A

    Making claims about effect size

    Hi, I'm working with a very large sample, and have realized that almost any blip in the data will register as p=0.000 due to the sample size. Of course there is a big difference between statistical significance and actual significance. I've been reading up on strategies for calculating...