Control of variable complications
2.1) Randomization is a sampling to control the variable complications due to the sample is divided into 3 steps random. Selection random assignment random, and treatmentAre to be found in the experimental
.2.2) Matching is paired samples with similar one pair to the 2 group. With the closest most
2.3) Blocking is to separate the samples with similar into subgroups. Each group is different obviously. In order to see the results of each subgroup differences
2.4) gathering of complications in study and control with statistical methods such as correlation some of (part and partial correlation) analysis of covariance. (ANCOVA) analysis of variance in many ways. By using variable complications as the blocks.
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