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info> author=Karin Meyer title=Choosing starting values for covariance components </texit> ====== Starting values for covariance components ====== To run WOMBAT, starting values for all matrices of covar... fferent locations or breeds, including literature values. * The more traits are analysed simultaneously

parameters, together with a note that ''Negative values for s.e. indicate failed approximation!''. What d... analyses where some covariance matrices have eigenvalues which are effectively zero. In the latter scenari... of the parameter space, i.e. has one or more eigenvalues close to zero. WOMBAT will attempt some damage co

come small, it is advisable to estimate their log values, thus removing any restriction. This parameterisa... omitting all principal components with small eigenvalues is generally sufficient to eliminate problems wit... is sequence, derived from the matrix of starting values. It would be easiest to maintain this order for

iance components to be estimated and the starting values to be used in the iterative estimation scheme. ... s followed by one or more lines with the starting values. * In addition there must be ''VAR'' stateme... residual'', and corresponding line(s) of starting values. In this example, we call the parameter file ''w

inal scale. == 1/7/2008 == WOMBAT now checks for values of zero for covariables fitted. If the data contains such values, it expects a 'special' option (see section 4.8 of the manual) telling it whether to ignore such records or treat them as valid values for the covariable. == 16/5/2008 == Added facili

{\hat{\boldmath \theta}_{1}}</latex> at the `test values' <latex>{\bf t}</latex>, and the corresponding co... </latex> variables, with details depending on the values of //p// and //q// and how many of the elements o

pDates|Updates and changes]] - [[wombat:StartingValues|Choosing starting values for covariance component

ate B-splines functions for given range or given values of covariable, with choice of equi-distant spline