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ContentsixMissing values in the explanatory variables . . . . . . . . . . . . . 1016.11 Some technical details about model fitting in ASReml . . . . . . . . . 101Sparse versus dense . . . . . . . . . . . . . . . . . . . . . . . . . . 101Ordering of terms in ASReml . . . . . . . . . . . . . . . . . . . . 102Aliassing and singularities . . . . . . . . . . . . . . . . . . . . . . 102Examples of aliassing . . . . . . . . . . . . . . . . . . . . . . . . . 1036.12 Analysis of variance table . . . . . . . . . . . . . . . . . . . . . . . . 1047 Command file: Specifying variance structures 1057.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106Non singular variance matrices . . . . . . . . . . . . . . . . . . . . 1067.2 Variance model specification in ASReml . . . . . . . . . . . . . . . . 1077.3 A sequence of structures for the NIN data . . . . . . . . . . . . . . . 1077.4 Variance structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115General syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115Variance header line . . . . . . . . . . . . . . . . . . . . . . . . . 117R structure definition . . . . . . . . . . . . . . . . . . . . . . . . 118G structure header and definition lines . . . . . . . . . . . . . . . 1207.5 Variance model description . . . . . . . . . . . . . . . . . . . . . . . . 120Forming variance models from correlation models . . . . . . . . . . 126Notes on the variance models . . . . . . . . . . . . . . . . . . . . 127