Confidence interval around a sample proportion using SPSS (June, 2020)

This video demonstrates how you can easily obtain a confidence interval around sample proportions using SPSS. In this video I focus on demonstration of Clopper-Pearson exact confidence intervals. You can obtain a copy of the data used in the video here: drive.google.c...
Note: Clopper-Pearson intervals are formed using the binomial sampling distribution (see en.wikipedia.o.... An alternative method (not shown in the video, but sometimes shown in textbooks) is to use the z-distribution to construct a symmetric interval around the proportion (referred to as 'normal distribution approximation'). That approach, however, is best used when the sample proportion is nearer to .50 [and not very close to 0 or 1] and/or your sample size is large. As your proportion gets closer to 0 or 1 (i.e., the boundaries for proportions), then larger and larger samples would be required to construct symmetric confidence intervals where one of the bounds does not end up falling outside the range of 0 and 1. A Powerpoint (drive.google.c...) and Excel (drive.google.c...) file can be downloaded that goes into more detail regarding using the 'normal distribution approximation'.

[@mikecrowson2462]

Hello everyone: This video was made years ago with an older version of SPSS. I am currently on SPSS 29 which includes a newer, cleaner interface for obtaining confidence intervals. If you would like to learn how to generate a confidence interval with the newer interface, go here: ruclips.net/video/0hchb8uUKNg/видео.html

[@jozicakutin7326]

Just found spss has a new specific procedure: Analyze>Descriptives>Proportion Confidence Intervals (version 28). Basically its own inbuilt applet.

[@mikecrowson2462]

Thanks for letting me know about that. I was using version 26 at the time I put this video together, so it's nice to see that they have upgraded! Cheers!

[@ramontargino1]

Thank you for the video! I have one question: Is it possible to calculate on SPSS the confidence interval of sample proportions cross-tabulated by another variable? Lets say we had the variable "sex" in the dataset. Would it be possible to calculate the confidence interval of the proportion of men who intended to vote, of men who did not intend to vote, of women who intended to vote and of women who did not intend to vote? If so, how can it be done?

[@taimishu]

Hi, I have this same question. Did you ever figure out how to do this?

[@blessingodia1153]

thank you so much

[@rexcalingasan4647]

Can a confidential interval arounbd a proportion be done in SPSS ver 26?