![]() ![]() Which values should be deleted because they are so high or so low that they are considered to be mistakes? Whether and how to normalize? Whether and how to transform the data? Sequential Analyses (ad hoc sample size determination) Multiple ways to preprocess the dataīefore the data are analyzed, some decisions get made. These simple and sensible rules are commonly violated in many ways as explained below. ![]() You take into account all the analyses when interpreting the results.All planned analyses were conducted exactly as planned and then reported.Basic rules of statisticsįor statistical analyses to be interpretable at face value, it is essential that these three statements be true: Surgeon: "Well, I tried each analysis on the SPSS drop-down menus, and that was the one that gave the smallest P value". Statistician: "Really? How did you come up with that?" Surgeon: "Yes, I used multinomial logistic regression." Statistician: "Oh, so you have already calculated the P value?" ![]()
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