## The Completely Randomized Design (CRD)The CRD is the simplest of all designs. It is equivalent to a t-test when only two treatments are examined.
- Replications of treatments are assigned completely at random to independent experimental subjects.
- Adjacent subjects could potentially have the same treatment.
A1 B1 C1 A2 D1 A3 D2 C2 B2 D3 C3 B3 C4 A4 B4 D4
PROC GLM; CLASS TREATS; MODEL WHATEVER = TREATS; RUN;
- CRD with subsampling: measurements are made on experimental sub-units.
- Randomized Complete Block (RCB): treatments are assigned at random within blocks of adjacent subjects, each treatment once per block.
- Two-way Factorial arrangement on a CRD: the treatments are combinations of two sets of treatments.
- Experiment with pseudo-replication: multiple measurements made on sub-units, but no replication on independent experimental units.
- Regression--treatments from a continuous range: treatments come from a single quantitative range.
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