# Minor job qualifiers.

## Introduction

Qualifiers are described in 4 sections based on frequency of use.
general syntax
The
major qualifiers
are
!CONTINUE, !CONTRAST, !FCON, !MAXIT, !SUBSET, !SUM
and XYplots (
!X !Y !G !JOIN
)
The qualifiers described here are less frequently required.
They include

(de)selecting multivariate mode:
!ASMV, !ASUV

Spatial arrangement in multienvironment trials:
!COLFAC !ROWFAC !SECTION

ANOVA qualifiers:
!DDF

graphics qualifiers:
!DISPLAY, !BMP, !EPS, !HPGL, !PS, !WMF, NODISPLAY

Missing values in design variables:
!MVINCLUDE, !MVREMOVE,

Setting predict points:
!PVAL, !GKRIGE, !PPOINTS

Setting spline knot points:
!SPLINE, !KNOTS,

Setting covariate grouping levels:
!FACPOINTS, !POLPOINTS,

My basis function:
!MBF

Rarely used qualifiers
## (De)selecting multivariate mode (!ASUV !ASMV)

!ASUV
indicates that while the data structure and linear model are
specified in a multivariate form, the residual variance structure is
not
IDENTITY
for `units` crossed with
US
for `traits`.
When !ASUV is specified,
it is often also necessary to include mv in the linear model
and to specify the !S2==1
qualifier on the R-structure lines.
!ASMV `t `
indicates that while the data structure and linear model are
specified in a univariate form, the data is actually arranged
in a `units` by `traits` form (`t `
nested within `n units`) and is to be analysed
using the residual variance structure
IDENTITY
for `units` crossed with
US
for `traits`.
## Spatial analysis of a multi-environment trial

When
!SECTION `site` !ROWFAC `row` !COLFAC `column `

is specified, ASReml generates the R-structure lines to fit
an
AR1 x AR1
variance structure for each site.

Read More.
## Denominator degrees of freedom.

!DDF `i`
gives the user some control of the calculation of the
denominator degrees of freedom. The ASReml default action
depends on the size and nature of the job.

!DDF -1
suppresses calculation of the denominator degrees of freedom
(and consequently the calculation of significance probablities)
for F-statistics reported in the
ANOVA
table.
## Graphics qualifiers

Whether ASReml produces graphics and whether they are displayed
on the screen is controlled by
was the Winteracter graphics library available for this platform,
have graphics been turned OFF on the
control line,
are they only produced in
hardcopy.
Graphics are produced by default unless suppressed. The
!DISPLAY `i`
qualifier controls which of four spatial analysis graphics are displayed.
If you run ASReml from WinASReml, graphics are produces as
.cgm
files and may then be exported in several formats.
Otherwise the default format is
postscript.
The format of these hardcopy files may be changed
on the
commandline
or by specifying one of the following on the datafile line:

!BMP
bitmap

!EPS
encapsulated postscript

!WMF
Windows Meta file

!PS
postscript

!HPGL
HP graphics language

!HPGL 2
HP graphics language II

## Missing values in the Design

When missing values occur in design variables (as opposed
to the response variable), the user must indicate whether
to discard the records with containing the missing values,
or whether to treat the missing values as zeros.

Read More.
## Setting predict points

When fitting polynomials or splines, it is sometimes desirable
to predict the response surface at points other than those for which
there is data. Use
!PVAL
to specify these points before the design matrix is formed so
that the extra points have the appropriate covariables generated.
Read More.
## Setting spline knot points

ASReml has a model term
spl(`x`[,`k`])
which, when fitted as a random term in conjunction with the
covariate `x` fitted as a fixed term generates a cubic
smoothing spline model. Several qualifiers modify the defaults
with respect to choosing knot points for the spline.
Read More.
## Setting covariate grouping levels:

The fac()
and pol() model terms need to classify a covariate
into discrete classes. This is usually done on the basis of
unique covariate values. However, ASReml will actually consider
close points as being the same. This is controlled by
!FACPOINTS and !POLPOINTS
qualifiers respectively.
## My Basis function

The spline function used in ASReml is the common cubic smoothing spline
and has a particular basis function. The
!MBF qualifier
provides a mechanism for a user to specify the spline covariables
based on some other basis function.
Read More.
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