Hi to everone,
I would like to ask you for little help with my statistics.
I have sample of 30 subjects  there is done some calculations with 5 different formulas on each subject (to calculate intraocular lens)(om each subject was done calculations with 5 formulas).
These calculalations are named(see attached file spss output file in PDF) RR_celkovo, RR_SRK2, RR_HillFRF, RR_Haigis, RR_Barret and their absoute values ABS_R_celkov, ABS_R_SRK2.......
I want to compare means of RR_celkovo with all other RR_. Also want to compare ABS_R_celkovo with all others ABS_R_...
I have done tests for normality and only RR_SRK2 seems to be normal (p>0,05, Shapiro wilk). Which test should I use to compare these groups? Mannwhitney?
RR_ Histograms dont look so much different from normal distrubution to me.
Do you think I could use parametric (ttest??) for RR_ groups?
I would be very grateful for your help.
Best regards
Ivajlo Popov
I would like to ask you for little help with my statistics.
I have sample of 30 subjects  there is done some calculations with 5 different formulas on each subject (to calculate intraocular lens)(om each subject was done calculations with 5 formulas).
These calculalations are named(see attached file spss output file in PDF) RR_celkovo, RR_SRK2, RR_HillFRF, RR_Haigis, RR_Barret and their absoute values ABS_R_celkov, ABS_R_SRK2.......
I want to compare means of RR_celkovo with all other RR_. Also want to compare ABS_R_celkovo with all others ABS_R_...
I have done tests for normality and only RR_SRK2 seems to be normal (p>0,05, Shapiro wilk). Which test should I use to compare these groups? Mannwhitney?
RR_ Histograms dont look so much different from normal distrubution to me.
Do you think I could use parametric (ttest??) for RR_ groups?
I would be very grateful for your help.
Best regards
Ivajlo Popov
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