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3 A guided tour 31Below is the ASReml command file for an RCB analysis of the NIN field trial datahighlighting the main sections. Note the order of the main sections.title line −→data field definition−→...data field definition −→data file name and qualifiers−→tabulate statement−→linear mixed model definition−→predict statement−→variance model specification−→..NIN Alliance trial 1989variety !Aidpidrawrepl 4nlocyieldlatlongrow 22column 11nin89.asd !skip 1tabulate yield ∼ varietyyield ∼ mu variety !r replpredict variety0 0 1repl 1repl 0 IDV 0.1The title lineThe first non-blank line in an ASReml commandfile is taken as the title for the job andis used to identify the analysis for future reference.NIN Alliance trial 1989variety !Aid.Reading the dataThe data fields are defined before the data filename is specified. Field definitions must begiven for all fields in the data file and in theorder in which they appear in the data file.Data field definitions must be indented.In this case there are 11 data fields (variety. . . column) in nin89.asd, see Section 3.3.The !A after variety tells ASReml that thefirst field is alphanumeric and the 4 after repltells ASReml that the field called repl (thefifth field read) is a numeric factor with 4 lev-NIN Alliance trial 1989variety !Aidpidrawrepl 4nlocyieldlatlongrow 22column 11nin89.asd !skip 1.