Hello,
I am running a pre-post study using several different instruments (e.g. 1-5 Likert scale instruments which produce a final score). It is being done to a group of employees at a hospital pre and post a new intervention approach with patients. However, as some of the questions on the instruments were sensitive (e.g., re: job satisfaction) the participants insisted that their questionnaire packages be anonymous. I now have ~25 pre packages and ~25 post packages to compare certain scales for. However, I know for a fact that my pre and post groups did not have all the same employees in them. I.e.) some people completed both (though I cannot identify which package is theirs because it is anonymous), some only completed the pre and some only completed the post.
My question is: How do I measure the pre-post differences in this group? The assumption of independent samples t-test does not work, because the samples are not entirely independent. However, the paired samples t-test also does not work because my pre and post samples do not have the exact same people in each.
Any advice with how to proceed would be greatly appreciated.
Thank you,
Lindsay
I am running a pre-post study using several different instruments (e.g. 1-5 Likert scale instruments which produce a final score). It is being done to a group of employees at a hospital pre and post a new intervention approach with patients. However, as some of the questions on the instruments were sensitive (e.g., re: job satisfaction) the participants insisted that their questionnaire packages be anonymous. I now have ~25 pre packages and ~25 post packages to compare certain scales for. However, I know for a fact that my pre and post groups did not have all the same employees in them. I.e.) some people completed both (though I cannot identify which package is theirs because it is anonymous), some only completed the pre and some only completed the post.
My question is: How do I measure the pre-post differences in this group? The assumption of independent samples t-test does not work, because the samples are not entirely independent. However, the paired samples t-test also does not work because my pre and post samples do not have the exact same people in each.
Any advice with how to proceed would be greatly appreciated.
Thank you,
Lindsay