The variable control complications 2.1) sample for Randomization as control variables, complications due to sample that is used is divided into 3 phases: random selection random assignment and random treatment is to make the samples are equal when they started doing research in experimental research. 2.2) Matching is matching similar examples one by one to get a sample of 2 groups that are close. 2.3.) is Blocking the separate groups with similar characteristics into groups by each group are different, clearly. This is to show the results that occurred in each of the different sub groups. 2.4) variable came complications study, then controlled by the statistical method, such as a partial correlation (part and partial correlation), analysis of variance (ANCOVA), analysis of variance, multiple complications by using variables as the block.
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