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tivariate analyses where some covariance matrices have eigenvalues which are effectively zero. In the la... o fit a reduced rank model. Otherwise, you simply have to accept that the approximation of standard erro... el. For instance, this can occur if you think you have single records per trait and animal but, in reali

?? ???? Examples under Windows ???? * **Q:** I have downloaded the examples and am trying to run them... st case. What is wrong ? * **A:** The examples have been produced under Linux. Windows/DOS and Linux ... ux runs using Excel data files ???? * **Q:** I have installed WOMBAT under Linux and the examples all

estion is how best to derive these. * Often we have estimates for the same (or very similar) traits f... ainst the choice of starting values. Usually we have some expectation of the relative importance of ea... om effect fitted; e.g. we expect a given trait to have high, medium or low heritability (about 0.5, 0.3

syntax you may use when editing the pages. Simply have a look at the source of this page by pressing the... ls of headlines to structure your content. If you have more than three headlines, a table of contents is... This is a list * The second item * You may have different levels * Another item - The same l

sis in quantitative genetics is the case where we have one trait of interest which is recorded only once, and where we have no additional random effects. Assuming a general pedigree (i.e. information from... er than both sire and dam codes. In this case, we have a single fixed effect -- generation -- with 2 lev

ecific effects are assumed to be uncorrelated but have heterogeneous variances. This gives Var(**r**) =... Dealing with `clones' ===== In some instances we have clones, i.e. subjects which are genetically ident... e naturally occuring clones. If these individuals have different identity codes and the same parents, WO

trix inversion. ==== 2007 ==== == 20/11/2007 == Have changed (made faster) computation of average info... g95 compiler. Both compiler and Windows versions have been fixed. == 29/06/2007 == New features have

eterisation ===== Choice of parameterisation can have a big impact on the convergence rates of REML ana... is generally fast to converge. However, problems have been encountered, in particular for * analyses

m stops when a certain maximum number of iterates have been carried out or when it considers changes bet... onverged after all. Alternatively, WOMBAT may not have reached the maximum number of iterations but prog

verse.out') write(2,*)det,n ! ... following lines have non-zero elements do i=1,neqns do j=1,i

tests. ==== Likelihood ratio test ==== Say we have a vector of parameters <latex>{\boldmath\theta}</