QTDT - Missing Values

By default, QTDT considers all non-numeric text values in Trait and Covariate columns of the pedigree file to represent missing values.

If you wish to use a numeric code, such as -99.999, to specify missing values use the -x option. All numbers in Trait or Covariate columns matching this value exactly will be considered missing values. Caution is obviously recommended when this option is used, as misinterpretation of the missing value code could cause unexpected results.

For example, the following command line specifies that the pedigree file mydata.ped (corresponding to datafile mydata.dat) uses -99.999 to encode missing values:

  prompt> qtdt -d mydata.in -p myped.in -x -99.999