Simple main effects/ 2X5 ANOVA/ L Matrix?
Rob Weisskirch
found someone who can help me figure this out on my campus. Perhaps a
someone could help?
I am trying to analyze data using a 2X5 ANOVA. I have two independent
variables and one dependent variable. The IVs are ethnicity (5 groups) and
citizenship (2 groups--yes/no) and DV score on a measure (continuous
variable).
I know there is a main effect for ethnicity on score.
There is no main effect for citizenship on score.
There is an interaction for ethnicity and citizenship on score.
So, here's the question:
I want to analyze the differences for each ethnic group whether or not they
are citizens for score. So, for example, I want to know if it matters
whether or not Latinos are citizens on their score.
I can get the interaction effects, but I can't figure out how to get SPSS to
reveal the statistics I'm interested in. My SPSS book says to use an /L
matrix, but I'm having trouble figuring out how to set up the syntax. Does
anyone know how to attain what I'm looking for?
Thanks for any advice!
Rob
Rob Weisskirch, MSW, Ph.D.
Human Development Program
Liberal Studies Institute, Building 15
100 Campus Center
California State University, Monterey Bay
Seaside, CA 93955-8001
jim clark
On Wed, 4 Dec 2002, Rob Weisskirch wrote:
> I am trying to analyze data using a 2X5 ANOVA. I have two
> independent variables and one dependent variable. The IVs are
> ethnicity (5 groups) and citizenship (2 groups--yes/no) and
> DV score on a measure (continuous variable).
> I want to analyze the differences for each ethnic group
> whether or not they are citizens for score. So, for example,
> I want to know if it matters whether or not Latinos are
> citizens on their score.
> I can get the interaction effects, but I can't figure out how
> to get SPSS to reveal the statistics I'm interested in. My
> SPSS book says to use an /L matrix, but I'm having trouble
> figuring out how to set up the syntax. Does anyone know how
> to attain what I'm looking for?
My brief look at the /L matrix approach on the www suggests that
it is more difficult to do simple effects in GLM than in MANOVA.
One site I found actually recommended checking the /L matrix
using the MANOVA approach. Type the following commands into a
syntax window (File | New | Syntax) to perform your analysis.
MANOVA score BY ethnic(1 5) citizen(1 2)
/DESIGN citizen W ethnic(1) citizen W ethnic(2)
citizen W ethnic(3) citizen W ethnic(4)
citizen W ethnic(5) ethnic
Now Run the command. Depending on factors that sometimes escape
me, you may need to open a Draft Output window to view all of the
MANOVA results.
Best wishes
Jim
============================================================================
James M. Clark (204) 786-9757
Department of Psychology (204) 774-4134 Fax
University of Winnipeg 4L05D
Winnipeg, Manitoba R3B 2E9 cl...@uwinnipeg.ca
CANADA http://www.uwinnipeg.ca/~clark
============================================================================
Bruce Weaver
On Wed, 4 Dec 2002, Rob Weisskirch wrote:
> I'm having an SPSS hardship on a research project I'm working on. I have not
> found someone who can help me figure this out on my campus. Perhaps a
> someone could help?
>
> I am trying to analyze data using a 2X5 ANOVA. I have two independent
> variables and one dependent variable. The IVs are ethnicity (5 groups) and
> citizenship (2 groups--yes/no) and DV score on a measure (continuous
> variable).
>
> I know there is a main effect for ethnicity on score.
>
> There is no main effect for citizenship on score.
>
> There is an interaction for ethnicity and citizenship on score.
>
> So, here's the question:
>
> I want to analyze the differences for each ethnic group whether or not they
> are citizens for score. So, for example, I want to know if it matters
> whether or not Latinos are citizens on their score.
>
> I can get the interaction effects, but I can't figure out how to get SPSS to
> reveal the statistics I'm interested in. My SPSS book says to use an /L
> matrix, but I'm having trouble figuring out how to set up the syntax. Does
> anyone know how to attain what I'm looking for?
>
>
>
> Thanks for any advice!
>
> Rob
>
Hi Rob,
Are you using GLM UNIANOVA to do the analysis? If so, I think you
will get the tests you want if you use COMPARE as in the following syntax:
UNIANOVA
y BY a b
/METHOD = SSTYPE(3)
/INTERCEPT = INCLUDE
/CRITERIA = ALPHA(.05)
/emmeans = table(a)
/emmeans = table(b)
/emmeans = table(a*b) COMPARE(b) /* <---- COMPARE option added here */
/plot = profile(b*a)
/DESIGN = a b a*b.
You'll have to substitute your variables where I have A and B. And
depending on how your variables are organized, you may have to change it
to COMPARE(a).
Cheers,
--
Bruce Weaver
E-mail: wea...@mcmaster.ca
Homepage: http://www.angelfire.com/wv/bwhomedir/