# effect sizes

1. ### Comparing effect sizes of two longitudinal linear relationships

Is there a way to determine if one longitudinal linear relationship is significantly stronger than another? I was planning on using regression (moderated multiple regression with PROCESS macro for SPSS because I have two groups and covariates) and simply looking at the R squared values, but my...
2. ### how to justify a sample size for an underpowered pilot study

moved to biostatics: how to justify a sample size for an underpowered pilot study UPDATE: I reposted this in the biostatistics forum. I also added some more details, mainly my not-fully-formed thoughts about how to proceed. Thanks! I need to justify a sample size of 30 or 32 (15 or 16 per...
3. ### calculating effect sizes in ML-WIN

Hi! I have run multivariate multilevel regression using MLwiN 2.30. I would like to report effect sizes for the significant main effects as well as interaction effects. These involve both continuous as well as dummy variables. Anybody know how to do this? And if it is not possible in...
4. ### Interaction effect of group (IV) and questionnaire type (DV) - Possible with MANOVA?

I already tried google and also the forum search - unfortunately I didn't find any good answer to my question: I want to know whether my two groups differ on two subscales of the same questionnaire. My hypothesis is that group 1 is worse on both subscales, but the difference to group 2 is...
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### Statistically correct to compare two Spearman's ρ-Vaules directly?

Hello statistic-community :wave: My sample size is approx. 1.500. I have different variables (A, B, C, D) which are all ordinal scaled. I have another variable (Z) which is ordinal scaled, too. Is it - in a statistical sense - correct, to calculate the Spearman's ρ with SPSS for each...
6. ### Calculate effect size from regression estimates for meta-analysis

Hi, I really hope someone can help me, I'm a bit stuck.. I'm running a meta-analysis looking at childhood predictors of personality disorders, so I'm pooling effect sizes of published longitudinal studies looking at this relationship. I need effect size data for all studies I want to...
7. ### Complex comparison of dependent effect sizes

Hi everyone, I am new to this forum, and still figuring out how to navigate the site. So, I apologize if this question has already been asked. In short, I am attempting to compare two dependent effect sizes. To be more detailed, I have two sets of repeated measures. At Time 1, all...