Mauchly's test of sphericity

[vickygri]

Hi, I am running some tests for my work.

I am doing my work on gender differences in leadership.
So I am using 2x2 mixed ANOVA. I go to SPSS...
The within-subject factor is Leadership Style variable with 2 levels
(Controlling, Influencing). The independent variable is a nominal level variable
(male, female).

This is what I get:
Mauchly's W = 1.000
Approx. Chi-Square = .000
df = 0
Sig. = .

What is the problem? Or what test and how should I use?
Thank you.

[Bruce Weaver]

Take a look at Thom Baguley's nice note on sphericity, and pay attention to the "Complications" section, which discusses the case where there are only two levels for a repeated measures factor.

   http://psychologicalstatistics.blogspot.com/2006/05/what-is-all-this-stuff-about.html

HTH.

vickygri wrote

Hi, I am running some tests for my work.

I am doing my work on gender differences in leadership.
So I am using 2x2 mixed ANOVA. I go to SPSS...
The within-subject factor is Leadership Style variable with 2 levels
(Controlling, Influencing). The independent variable is a nominal level variable
(male, female).

This is what I get:
Mauchly's W = 1.000
Approx. Chi-Square = .000
df = 0
Sig. = .

What is the problem? Or what test and how should I use?
Thank you.

[Swank, Paul R]

With only two levels of the repeated measures, there is only one covariance so the covariance can't be different for different pairs. There is only one.

Dr. Paul R. Swank,
Professor and Director of Research
Children's Learning Institute
University of Texas Health Science Center-Houston


-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of vickygri
Sent: Thursday, April 21, 2011 6:02 AM
To: [hidden email]
Subject: Mauchly's test of sphericity

Hi, I am running some tests for my work.

I am doing my work on gender differences in leadership.
So I am using 2x2 mixed ANOVA. I go to SPSS...
The within-subject factor is Leadership Style variable with 2 levels
(Controlling, Influencing). The independent variable is a nominal level
variable
(male, female).

This is what I get:
Mauchly's W = 1.000
Approx. Chi-Square = .000
df = 0
Sig. = .

What is the problem? Or what test and how should I use?
Thank you.

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