# Questions tagged [jasp]

JASP is an open source statistical package designed especially with statistical non-experts in mind.

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### Shapiro Wilk test of normality

I ran my data under JASP and the p-value for the shapiro wilk test of normality was <.001. How do I interpret this?
• 11
1 vote
1 answer
21 views

### How are simple effects calculated in JASP (and how to calculate them properly)?

I'm conducting 3-way (2x2x2) repeated measures ANOVA in JASP with a main factor of interest called symm, and two other factors: emotion (neutral/fearful) and masking (masked/unmasked). I want to ...
• 11
0 votes
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15 views

### Power analysis: How do you calculate the power (1-B) based on the matched-pairs biserial correlation effect size?

I am running a Wilcoxon-signed rank test, and as suggested by King et al., the best effect size to report for this analysis would be the matched-pairs rank biserial correlation. How is the power (1-B) ...
0 votes
0 answers
23 views

### Is it okay to do a moderation anaylsis after the normality assumption failed (Shapiro Wilk)?

I am currently conducting a study on the suicide topic and entering the data analysis period. The Shapiro Wilk analysis reported that all my data failed the normality assumption. Most of the data's p ...
• 101
0 votes
0 answers
23 views

### 2x2 repeated measures Bayesian ANOVA (interaction)

One reviewer asked me to include Bayesian analysis in my paper, but I am not sure that I am getting this right, so any help would be much appreciated. I paste the JASP output with BF10 and with BF01: ...
0 votes
0 answers
12 views

### How to categorize data by combining the IVs (Independent Variables) to run a factorial ANOVA test on JASP?

How do I clean up a Likert scale data set taken from qualtrics survey platform to run a factorial ANOVA test to make it 2x2 (2 levels)? NOTE: Questions are randomized and structured as: High Normative,...
3 votes
2 answers
82 views

### Controlling for age in $t$-test

I have submitted a paper where I have performed a $t$-test between 2 groups A and B (coded as a dummy variable) to compare the mean of an Inattention scale derived from CFA analysis of the ADHD self-...
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0 votes
0 answers
60 views

### p-value for Shapiro-Wilk is high but data doesn't appear normal

I'm a beginner at stats and I'm trying to understand p-values for paired t-test and Shapiro-Wilks using the JASP Moon and Aggression data set (hope the screenshot resolution is ok - click on the image ...
• 619
1 vote
0 answers
38 views

### Doubt on regression analysis interpretation

I have a dataset made of more than 10K observations. For each of them I know the value of a continuous variable (C1), and the value of three nominal variables: N1, which can take three different ...
0 votes
1 answer
540 views

### Bayesian ANOVA : simple main effect and post-hoc analysis

I'm conducting a two-way ANOVA with one within-subjects factor A (A1; A2) and one between-subjects factor B (B1; B2), but I would like conduct this with the bayesian approach. I did it with JASP. ...
1 vote
0 answers
187 views

### ANCOVA with two (related) factors

I'm analysing data from a repeated-measures study, in two participant groups (call them patient and control groups). I have measured a dependent variable response. Both the patient and control groups ...
• 215
1 vote
1 answer
2k views

### Different results for Bayesian ANOVA in JASP and R (BayesFactor)

I computed Bayes Factors for a repeated measures ANOVA in JASP and the R package BayesFactor. There were two between-subjects groups (factor "group") with multiple measurements. However, the results ...