Forms a factor to index the units of the final stratum of a design (R.W. Payne & W. van den Berg).
Option
BLOCKSTRUCTURE = formula |
Defines the block factors for the design; the default is to take those specified by the BLOCKSTRUCTURE directive |
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Parameter
UNITS = factor |
Factor to be formed |
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Description
When analysing experimental data in Genstat, it is usually unnecessary to specify the final stratum of the design. For example ANOVA, as explained in the Guide to the Genstat Command Language, Part 2, Section 4.2.1, will set up an internal factor called *Units* to define (along with the other block factors) the final stratum. However, it is then impossible, for example, to put the residuals into a table classified by the block factors, or to tabulate the treatment levels according to the block structure. Thus AFUNITS takes a set of block factors (specified in either a pointer or a model formula by the BLOCKSTRUCTURE option) and sets up the necessary extra factor, which is then returned by the UNITS parameter.
Option: BLOCKSTRUCTURE.
Parameter: UNITS.
Method
The FCLASSIFICATION and FORMULA directives are used, if necessary, to form a list of factors from the block formulae and then the factor values are set up using the standard Genstat facilities for calculations and manipulation.
Action with RESTRICT
None of the block factors must be restricted.
See also
Procedure: AFLABELS.
Commands for: Design of experiments.
Example
CAPTION 'AFUNITS example'; STYLE=meta FACTOR [LEVELS=3; VALUES=6(3,1,2)] Blocks & [LEVELS=2; VALUES=3(1,2)2,3(2,1)] Plots AFUNITS [Blocks] WithinB & [Blocks/Plots] WithinBP PRINT Blocks,Plots,WithinB,WithinBP