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Hello, I am new to the group. I am completing my dissertation and trying to learn SPSS on my own. I've done my best to explain the problem, but if I have left something out, please let me knowMy design is a retrospective one group pretest posttest: I'm looking at multiple (13 total) cardiac risk factors before/after participating in a cardiac rehab program. Not everyone had pretest and/or posttest results, so I made the decision to include the risk factor in the analysis as long as it included both a pretest and posttest value - this means I do not have the same number of pairs for all of the risk factors, and will have to run tests of normalcy on each risk factor. Before this I wanted to look for outliers using the IQR method and did the following method, these were found online and confirmed by watching several tutorials on the same subject:1) Analyze>Descriptive Statistics>Explore 2) Select the variable to the Dependent List 3) Under Statistics, select Descriptives, Outliers, and Percentiles.4) Under Plots, de-select Stem and Plots and leave the rest as is. 5) Leave Options and Bootstraps as is When I follow these instructions and the only variable I select is PreA1c, I get the following informationEXAMINE VARIABLES=Pre.A1c /PLOT BOXPLOT /COMPARE GROUPS /PERCENTILES(5,10,25,50,75,90,95) HAVERAGE /STATISTICS DESCRIPTIVES EXTREME /CINTERVAL 95 /MISSING LISTWISE /NOTOTAL.
When I run this test again, but select all of the pretest variables (including the preA1c) this is the log and boxplot I receive:EXAMINE VARIABLES=Pre.A1c Post.eAG Pre.SBP Pre.DBP Pre.TotChol Pre.HDL Pre.CholHDLRatio Pre.VLDL Pre.LDL Pre.Tri Pre.NonHSL Pre.Wt Pre.BMI /PLOT BOXPLOT /COMPARE GROUPS /PERCENTILES(5,10,25,50,75,90,95) HAVERAGE /STATISTICS DESCRIPTIVES EXTREME /CINTERVAL 95 /MISSING LISTWISE /NOTOTAL.
I do not understand why the same variable displays different information, when the only difference was the number of variables I selected. The variables are independent of one another, but I see that the box I must select them to under Explore is a Dependent List. Is this why there is a difference? And if so, would I correct this by simply running each variable by itself as I did in the first example?
Thank you in advance. Brian Foster