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start [2022/07/29 10:43]
154.54.249.197 old revision restored (2022/04/21 09:02)
start [2022/07/29 10:44]
154.54.249.197 old revision restored (2022/03/31 04:37)
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 Study Design: Study Design:
-Survival Analysis Sample Size Calculation+Sample Size Calculation: Proc power
 Non-survival analysis sample size calculation Non-survival analysis sample size calculation
 +Randomization
 +
 +== effect size ==
 +
 +Effect size is the treatment difference caused by different treatments.
 +It signifies the  magnitude of treatment effects.
 +
 +The difference can be measured in categorical variables or in continuous variables.  Difference in proportion can be one type of effect size; difference in means can be another type.
 +
 +==how to do randomization?==
 +
 +Randomization can be done by proc plan
 +
 +It can also be done by using randomization SAS functions.
 +
 +==sample size==
 +
 +Sample size can be calculated using proc power in SAS; or using special software like nQuery, PASS, East, etc.
 +
 +The key is to find the number of subjects that would let us gain the statistical power for the clincial trial.
 +
 +=====Structure of Statistics=====
 +
 +
start.txt ยท Last modified: 2022/10/07 23:15 by 216.244.66.228