Experimental Designs

  • Completely Randomized Design

    A completely randomized (CR) design, which is the simplest type of the basic designs, may be defined as a design in which the treatments are assigned to experimental units completely at random, that is the randomization is done without any restrictions. The design is completely flexible, i.e., any number of treatments and any number of […]

  • Basic Principles of Experimental Designs

    The basic principles of experimental designs are randomization, replication and local control. These principles make a valid test of significance possible. Each of them is described briefly in the following subsections. (1) Randomization. The first principle of an experimental design is randomization, which is a random process of assigning treatments to the experimental units. The […]

  • Introduction to Experimental Designs

    By an experimental design, we mean a plan used to collect the data relevant to the problem under study in such a way as to provide a basis for valid and objective inference about the stated problem. The plan usually consists of the selection of treatments whose effects are to be studied, the specification of […]