# effect size

1. ### Cohen's d for one-sample/paired-samples vs. independent samples, and pooled SDs

I have a few questions for you all about Cohen's d and pooled SDs! This is my first post, hope it goes in line with forum guidelines. 1) one-sample / paired-sample vs. independent samples Cohen's d calculation It seems that for calculation of Cohen's d (an estimate of effect size), you...
2. ### Eefect size

Hi.. i have a question on effect size..i get a negative value of effect size..should i report it as an absolute value or a negative value.. and one more thing, if i swapped the means and SD in the effect size calculator,,i get the same value minus the negative sign...how do i determine...
3. ### Determining error of a slope based on a dependent variable containing error

I am currently attempting to compare the slopes of many linear graphs. Each graph is a plot of Time (independent variable) vs. Effect Size (dependent variable). I know the standard error associated with each measure of Effect Size. I want to know the error of the slope of each graph. However...
4. ### 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...
5. ### 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...
6. ### 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...
7. ### 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...
8. ### 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...
9. ### 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...
10. ### 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...