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    Ratio of number of cases to control

    the control group or normal people is obtained from healthy volunteers attending the hospital for regular health check-up
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    Ratio of number of cases to control

    Dear hlsmith Thank you for your concern. I am examining a group of patients against a group of normal people and measuring some parameters to compare them between the 2 groups. I hope that I have clarified the study design, Looking forward to your kind response.
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    Ratio of number of cases to control

    Is taking 20 control and 90 patients in a 2 groups study statistically correct in comparing various parameters? I mean that the patient group is higher in number than control group. > Is that statistically correct?
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    There are no valid cases for VAR when GRP = .. Statistics cannot be computed for this

    When I perform a normality test for my variables using the grouping variable named "Group", I got a warning message telling me that there are values in the grouping variable named "Group" equal ".." ! knowing that I revised all the values in it and they were all with specific values .Also the...