PROC BTL <options> ;

The PROC BTL statement invokes the procedure. You can specify the following options.

DATA=SAS-data-set

names the SAS data set to be used by PROC BTL. The default is the most recently created data set.

MAP=SAS-data-set

names the marker map data set to be used. It can include the variables Marker, Location, and Name and a user-designated linkage group variable. The user can specify the name of the numeric linkage group variable in the GROUP= option in the MARKER statement, and this data set must be sorted by this variable. The variable Marker must contain the names of the variables specified in the MARKER statement. If this variable is not in the MAP= data set, the order of the markers in the MARKER statement is used. The Name variable, if present in this data set, is displayed in the "Model Statistics" table when ALL=1 is specified in the MARKER statement. If the Location variable is in the data set, it is used for calculating the recombination parameters between pairs of markers, , when the PARMEST statement is given.

For a backcross, A is the default value for the homozygous genotype and B is the default value for the heterozygous genotype. For an F cross, A is the default value for the genotype homozygous in parent 1’s allele, B is the default value for the heterozygous genotype, and C is the default value for the genotype homozygous in parent 2’s allele. If values other than these are used, they need to be specified using the HOMOZYGOUS=, HETEROZYGOUS=, and HOMOZYGOUS2= options in the PARMEST statement.

NOMCMPR

suppresses the display of the "Marker Class Means" table.

NOPARMPR

suppresses the display of the "Parameter Estimates" table.

NOPRINT

suppresses all output.

NOREGPR

suppresses the display of the "Model Statistics" table.

ORDER=DATA

ORDER=FORMATTED

ORDER=FREQ

ORDER=INTERNAL

specifies the sorting order for the levels of all CLASS variables. This ordering determines which parameters in the model correspond to each level in the data.

The default is ORDER=FORMATTED. When the default ORDER=FORMATTED is in effect for numeric variables for which you have supplied no explicit format, the levels are ordered by their internal values.

The following table shows how PROC BTL interprets values of the ORDER= option.

Value of ORDER=	Levels Sorted By
DATA	order of appearance in the input data set
FORMATTED	external formatted value, except for numeric
	variables with no explicit format, which are
	sorted by their unformatted (internal) value
FREQ	descending frequency count; levels with the
	most observations come first in the order
INTERNAL	unformatted value

For FORMATTED and INTERNAL, the sort order is machine dependent.

For more information about sorting order, see the chapter on the SORT procedure in the Base SAS Procedures Guide and the discussion of BY-group processing in SAS Language Reference: Concepts.