# levene's test

1. ### Mixed ANOVA - Can We Standardize After Box-Cox Transformed Values

Background: In a mixed ANOVA (2 timepoints, 3 interventiongroups, so 2x3 factorial ANOVA), the homogeneity of the residual variance was violated as indicated by significant Levene test, for the post-intervention measurement timepoint (T2) As far as I understand it, this prohibits any further...
2. ### Testing normality of distribution: Shapiro-Wilk's test/Levene's test?

I have data from an experiment with 5 conditions. The goal is to compare the impact of treatment on dependent variables between the conditions. To determine whether to use ANOVA or non-parametric equivalents, I conducted Shapiro-Wilk's test. It shows that the data is not normally distributed, so...
3. ### Working around a significant Levene's test in an ANCOVA?

Hi there, I'm working with some data in which I'm looking for mean differences across 15 subject categories of data on a variable (Clicks) that also covaries with another (Time). I'm trying to control for Time to neutralize its effect on the mean differences in which I'm interested. I've...
4. ### Mixed ANOVA - normal distribution with heterogeneity - transformation advice

Hello, First time poster here. Any advice is appreciated: I'm doing analysis of clinical trial data using SPSS. I'm doing a mixed ANOVA looking at score differences at three points in time (baseline, middle, final) for two groups of people (Intervention, Control). N=76, intervention n=26...
5. ### URGENT** ANOVA or Regression - Please help

Hi, I would really appreciate some help with this. I am looking to see if employees' organisational history (such as voluntary/involuntary turnover) and their contract type (part or full-time) impacts on their organisational commitment and empowerment. So I have 2 Dependent Variables...
6. ### URGENT: Two-Way Anova or Regression

Hi, I would really appreciate some help with this. I am looking to see if employees' organisational history (such as voluntary/involuntary turnover) and their contract type (part or full-time) impacts on their organisational commitment and empowerment. So I have 2 Dependent Variables...
7. ### Equality of Variance for Paired Data- alternative for Leven's Test?

Hello, I have set up an experiment that tests 3 instruments on 35 different people. Each person gets tested three times with each instrument (see below). Now i understand this is paired data, i was just wondering whether there is a statistical test to check for equality of variance. From...
8. ### Levene's Test in SPSS

Hi All, I am trying to figure out if the Levene's Test offered in SPSS under the One-Way ANOVA option 'Homogeneity of Variance Test' runs it's analysis with the traditional Levene's formula or if it runs the analysis using the modified Levene's formula. Does anyone happen to know if this...
9. ### Is Levene's transformation with ANOVA equivalent to Levene's W?

Hello, Just a quick question that I have been pondering: I read an article (Plavcan and Cope, 2001 Evol. Anthro.) where they say that Levene's test is a transformation of data X'=|X-mean(X)| then used in an ANOVA. Is this really the same as the Levene's W statistic (test for homogeneity of...