[R] randomized block design and two-way factorial design

Bill Simpson wsi at gcal.ac.uk
Wed Dec 13 10:16:58 CET 2000

On Tue, 12 Dec 2000, Michael Wang wrote:

> I am still a little unclear in the difference between
> randomized block design and two-way factorial design
> after consulting a few books, including John Rice 
> Mathematical Statistics and Data Analysis.

A place to post general stats questions:

You need a different sort of book. Here is a good one for this topic:
Neter & Wasserman, Applied linear statistical models. Irwin

Basically the difference in analysis is due to the experimental design. In
straight 2-way factorial, the subjects (experimental units, whatever) are
assigned at random to conditions (cells in your 2-way layout). In
randomized blocks, the subjects are first sorted into homogeneous blocks
and then they're assigned at random within the blocks.

The analysis has to take account of the way the expt was run.

I'm not sure if you can self-teach this stuff. You might want to
take a course.


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