# Thread: Significance test for two proportions using SPSS

1. ## Significance test for two proportions using SPSS

Hi,

I have a binary data set which I have calculated proportions for and would like to compare and test 2 proportions for a significant difference. I'm a little confused as to what test would be appropriate for me to use in this scenario / how to interpret the output.
Any help would be massively appreciated.
Thank you.

2. ## Re: Significance test for two proportions using SPSS

If you want to compare binary measures from the same sample,
then McNemar's test comes into mind.

With kind regards

K.

3. ## Re: Significance test for two proportions using SPSS

Thanks for the reply Karabiner. I've done some more researching - could I also use a Chi-square test of independence between the two data sets? If not, is there a reason why not?

4. ## Re: Significance test for two proportions using SPSS

What do you mean by data sets, exactely?
You said "I have a binary data set". Therefore, I
assumed that there are several binary variables,
measured within the same sample. This would be
a repeated measures (dependent samples) design,
and Chi² is for independent groups. But maybe
your data set looks different. Perhaps you should
desribe your research in a bit more detail first (topic,
research question, design, variables, sample size).

With kind regards

K.

5. ## Re: Significance test for two proportions using SPSS

Sure - sorry I realise I was quite confusing.

Basically I have one data set with binary responses to three conditions (Baseline, A and B).
My design is within subjects (repeated measures), so they all respond to baseline, condition A and condition B. I wish to compare the proportions of response to baseline to those proportions of condition A and then condition B. My sample size is 32 (32 responses in baseline, condition a and b).

Hopefully that makes more sense.
Thank you!

6. ## Re: Significance test for two proportions using SPSS

Repeated measures of binary responses can be analysed using Cochran's Q and McNemar's test.
Chi² tesf for independence, in contrast, is for independent samples.

With kind regards

K.

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