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5 Command file: Reading the data 68List of occasionally used job control qualifiersqualifieractionNew!DDF [i]requests computation of the approximate denominatordegrees of freedom according to Kenward and Roger (1997)for the Analysis of Variance of fixed effects terms in the densepart of the linear mixed model. There are three options fori: i = −1 suppresses computation, i = 1 and i = 2 computethe denominator d.f. using numerical and algebraic methodsrespectively.If i is omitted then i = 2 is assumed.If !DDF i is omitted, i = −1 is assumed except for small jobs(< 10 parameters, < 500 fixed effects, < 10, 000 equationsand < 100 Mbyte workspace) when i = 2.!DISPLAY n!EPSCalculation of the denominator degrees of freedom is computationallyexpensive. Numerical derivatives require an extraevaluation of the mixed model equations for every varianceparameter. Algebraic derivatives require a large dense matrix,potentially of order number of equations plus number ofrecords and is not available when MAXIT is 1 or for multivariateanalysis.is used to select particular graphic displays. In spatial analysisof field trials, four graphic displays are possible (see Section13.4). Coding these1=variogram2=histogram4=row and column trends8=perspective plot of residuals,set n to the sum of the codes for the desired graphics. Thedefault is 9. These graphics are only displayed in versionsof ASReml linked with Winteracter (that is, Linux, Sun andPC) versions. Line printer versions of these graphics are writtento the .res file. See the G command line option (Section12.3 on graphics) for how to save the graphs in a file for printing.Use !NODISPLAY to suppress graphic displays.sets hardcopy graphics file type to .eps.!G v is used to set a grouping variable for plotting, see !X.