Problem with ANOVA

[SPSS SPSS]

Hello SPSS'ers:

  I have two variables, independent (types of learning; 4 types) and one independent
  variable (understanding scores). I wanna investigate the effect of those 4 types of learning on the understanding. Which analysis would be appropriate in this regard? One-way or two-way ANOVA? Please advise. Thanks alot

  Ahmed


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[statisticsdoc]

Ahmed,

In answering this question, I am assuming that your four types of learning
represent mutually exclusive categories (i.e., subjects can appear in only
one category), and that your dependent variable is an interval-level measure
with a fairly normal distribution and consistent variance in each of the
four categories.

If the four categories represent combinations of two dimensions (i.e., Hi/Lo
on Dimension A crossed with Hi/Lo on Dimension B), then your should be
looking at a 2 by 2 two-way ANOVA.  If the four categories simply represent
mutually exclusive categories, then look at a one-way ANOVA.

HTH,

Stephen Brand

For personalized and professional consultation in statistics and research
design, visit
www.statisticsdoc.com


-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]]On Behalf Of
SPSS SPSS
Sent: Saturday, February 17, 2007 7:02 PM
To: [hidden email]
Subject: Problem with ANOVA


Hello SPSS'ers:

  I have two variables, independent (types of learning; 4 types) and one
independent
  variable (understanding scores). I wanna investigate the effect of those 4
types of learning on the understanding. Which analysis would be appropriate
in this regard? One-way or two-way ANOVA? Please advise. Thanks alot

  Ahmed


---------------------------------
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get things done faster.

[statisticsdoc]

Ahmed,

Now that I have seen the variables, it appears that the four learning types
are actually scores on four distinct variables, representing different
learning styles.  This changes the nature of the analysis considerably.  You
should consider correlation and regression.  It would be possible to conduct
a one-way ANOVA, classifying subjects by their highest score on the four
learning variables, but this approach would lose a lot of information (e.g.,
it does not distinguish between people who are slightly higher on one of the
four learning styles from those who are a lot higher on one of the styles.

Can you tell us a little more about your research questions and hypotheses?

HTH,

Stephen Brand

For personalized and professional consultation in statistics and research
design, visit
www.statisticsdoc.com


-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]]On Behalf Of
SPSS SPSS
Sent: Saturday, February 17, 2007 7:02 PM
To: [hidden email]
Subject: Problem with ANOVA


Hello SPSS'ers:

  I have two variables, independent (types of learning; 4 types) and one
independent
  variable (understanding scores). I wanna investigate the effect of those 4
types of learning on the understanding. Which analysis would be appropriate
in this regard? One-way or two-way ANOVA? Please advise. Thanks alot

  Ahmed


---------------------------------
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get things done faster.

[Ornelas, Fermin]

You could use one way anova if you choose to ignore the teachers under
each method. You could also include the schools where the teaching took
place. If you include either one of those two factors in the analysis
they could be considered as random factors.

As an example I developed an experiment where I measured the effects of
two cleaner products on tile grout. Having two people applying the
treatments required that the applicators be introduced as random
factors.

-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]] On Behalf Of
Statisticsdoc
Sent: Monday, February 19, 2007 6:52 AM
To: [hidden email]
Subject: Re: Problem with ANOVA

Ahmed,

Now that I have seen the variables, it appears that the four learning
types
are actually scores on four distinct variables, representing different
learning styles.  This changes the nature of the analysis considerably.
You
should consider correlation and regression.  It would be possible to
conduct
a one-way ANOVA, classifying subjects by their highest score on the four
learning variables, but this approach would lose a lot of information
(e.g.,
it does not distinguish between people who are slightly higher on one of
the
four learning styles from those who are a lot higher on one of the
styles.

Can you tell us a little more about your research questions and
hypotheses?

HTH,

Stephen Brand

For personalized and professional consultation in statistics and
research
design, visit
www.statisticsdoc.com


-----Original Message-----
From: SPSSX(r) Discussion [mailto:[hidden email]]On Behalf Of
SPSS SPSS
Sent: Saturday, February 17, 2007 7:02 PM
To: [hidden email]
Subject: Problem with ANOVA


Hello SPSS'ers:

  I have two variables, independent (types of learning; 4 types) and one
independent
  variable (understanding scores). I wanna investigate the effect of
those 4
types of learning on the understanding. Which analysis would be
appropriate
in this regard? One-way or two-way ANOVA? Please advise. Thanks alot

  Ahmed


---------------------------------
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and
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[John den Dunnen]

Hello,

I send this off topic question a view days ago to the list. Some people
asked for clarrification, therefore I rephrased my question. Who can help me
with my off topic question.

A sample was analyzed x (for e.g., 15)  times. I used the descriptive
funtion to calculate the mean and standard deviation (square root of the
average of the squares of deviations about the mean of a set of data) of
these measurements.

This sample will be used as In Process Control for the assay. For this
purpose the sample will be analyzed in duplicate or triplicate.

I want to set a criteria for the standard deviation of this duplicate or
triplicate analysis. These criteria should be based on the standarddeviation
of the x (for e.g., 15) measurements.

How can I estimate the standard deviation for tese duplicate and triplicate
measurements.

With regards,

John