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5 Command file: Reading the data 77List of rarely used job control qualifiersqualifieractionNewNewNewNewNew!SCREEN [n] [ !SMX m ]!SLNFORM [n]!SPATIAL!TABFORM [n]!TXTFORM [n]performs a ’Regression Screen’, a form of all subsets regression.For d model terms in the DENSE equations, thereare 2 d − 1 possible submodels. Since for d > 8, 2 d − 1 islarge, the submodels explored are reduced by the parametersn and m so that only models with at least n (default 1) termsbut no more than m (default 6) terms are considered. Theoutput (see page 192) is a report to the .asr file with a linefor every submodel showing the sums of squares, degrees offreedom and terms in the model. There is a limit of d = 20model terms in the screen. ASReml will not allow interactionsto be included in the screened terms. For example, toidentify which three of my set of 12 covariates best explainmy dependent variable given the other terms in the model,specify !SCREEN 3 !SMX 3. The number of models evaluatedquickly increases with d but ASReml has an arbitrary limit of900 submodels evaluated. Use the !DENSE qualifier to controlwhich terms are screened. The screen is conditional on allother terms (those in the SPARSE equations) being present.modifies the format of the .sln file.!SLNFORM -1 prevents the .sln file from being written.!SLNFORM 1 is TAB separated: .sln becomes sln.txt!SLNFORM 2 is COMMA separated: .sln becomes sln.csv!SLNFORM 3 is Ampersand separated: .sln becomes sln.texSee !TXTFORM for more detail.increases the amount of information reported on the residualsobtained from the analysis of a two dimensional regular gridfield trial. The information is written to the .res file.controls form of the .tab file!TABFORM 1 is TAB separated: .tab becomes tab.txt!TABFORM 2 is COMMA separated: .tab becomes tab.csv!TABFORM 3 is Ampersand separated: .tab becomes tab.texSee !TXTFORM for more detail.sets the default argument for !PVSFORM, !SLNFORM, !TABFORMand !YHTFORM if these are not explicitly set. !TXTFORM (or!TXTFORM 1) replaces multiple spaces with TAB and changesthe file extension to, say, sln.txt. This makes it easier toload the solutions into Excel.!TXTFORM 2 replaces multiple spaces with COMMA andchanges the file extension to, say, sln.csv. However, sincefactor labels sometimes contain COMMAS, this form is notso convenient.