I want as part of my job, research the faceturs associated with HIV in 2015 and 2017 and compare the odds ratio over these two periods. My concern is that the sample is not the same. I would like to know if there is an opportunity to do it.
yes, you can.
you can simply compare two values of odds/ odds ratio in different sample or in one sample in different time. Anago Mahena Gildas
I agree with Asaad Sharhani . It does not matter if the sample are not the same. Odds ratio is a is a probability value, regardless of the samples size.
please explain the objectives of your investigation so that we may know how are you going to draw the inference of your study
and why do you to use odds instead of relative risk ration?
Thank you for your answer. I have two survey which involved MSM people. The first has been taken place in 2015 and the second in 2017. I wan't to know if the sexual behaviors of those population are changed . To do that, i use logistics regression and i want to compare the Odds ration throught a statistic test. The population of this two survey are not the same.
Remember to take into consideration the 95% confidence intervals of the ORs you wanna compare.
Yes you can do it. Please just follow the indication of Asaad and dont foget the 90% CI. Thanks.
Definately you can compare both the values of Odds ratio but you should keep one thing in your mind that both Odds value should be at 95% CI.
okay now I understand for such reasons you can use odds however it could sound more professional if you could include the 95% confidence interval as well.
so using logistic regression you expect to have binary outcomes? if yes what is it? and what is your outcome measures?
Ideally, like should be compared with like. But your data come from two sources/ two different universe, since the samples are from two different years. As it is not a pre-test, post-test design, rather comparison of interventions in 2015 and 2017, so sample size difference is not that important. But as has been suggested by some friends, please keep the confidence level in each sample equal and conventionallay above 95% for calculating the odds first. Please control other variables that may confound.
yes you can do it as long you want to have associted factor to HIV
Yes, the two Odd ratios can be compared taking into consideration the issues raised by Isabel.
I need to do statistical signifinace test between the results of my replication study and the original study. There are 30 survey questions with three responses to each. I have percentages of each response. How can I compare these percentages between two studies.
Attached is the data. (There are also mean and SD. Those were calculated based on the reponses on Likert scale of 1-5)
Thanks in advance.
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