DEX CHECK CLASSIC

DEX CHECK CLASSIC (LET)

Let Subcommand

Given a list of factor variables, check to see if they are in classic form for a 2-level full or fractional factorial design.

For 2-level full or fractional factorial design, the low level is typically coded as "-1" and the upper level is typically coded as "+1". Center points are typically coded as "0". This command checks whether each of the listed factor variables contains only "-1", "+1" and "0" values.

If the factor variables are in the original units rather than coded as -1 and +1, you can use the CODE DEX command to convert them to -1 and +1 values.

LET <iflag> = DEX CHECK CLASSIC <name1> <name2> ... <namek>
where <name1> <name2> ... <namek> is a list of 1 to k variable names;
and <iflag> is a parameter where the status is saved.

If all variable names contain only -1, +1, or 0, <iflag> will be set to 1. Otherwise <iflag> will be set to 0.

LET IFLAG = DEX CHECK CLASSIC X1 X2 X3
LET IFLAG = DEX CHECK CLASSIC X1 X2 X3 X4 X5

The TO syntax is not supported for this command. That is,
LET IFLAG = DEX CHECK CLASSIC X1 TO X5
should be coded as
LET STALL = STRING COMBINE X1 TO X5 LET IFLAG = DEX CHECK CLASSIC ^STALL

None

None

CODE DEX	=	Convert data to -1, 0, +1 codeing.
CHECK TYPES	=	Check the types for a list of names.
CHECK EQUAL LENGTH	=	Check whether a list of variables have the same number of elements.

Analysis of full and fractional factorial designs

2018/02

 
skip 25
read scott_8_16.dat y x1 to x8
let stall = string combine x1 to x^k
let iflag = dex check classic ^stall