Exercises. ASReml Tutorial: B4 Bivariate Analysis p. 55

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1 Exercises Coopworth data set - see Reference manual Five traits with varying amounts of data. No depth of pedigree (dams not linked to sires) Do univariate analyses Do bivariate analyses. Use COOP data set and attempt multivariate models. ASReml Tutorial: B4 Bivariate Analysis p. 55

2 Multivariate analysis Modelling becomes more difficult as number of traits increases - there may be variance but the matrix may not be positive definite (covariances too big). - Maybe do bivariate pairs first -!GP constrain positive definite - will use EM updates if AI updates generate NPD matrix - try FA or CHOL reduced parameterization - try Singular XFA or CHOL paramaterization ASReml Tutorial: B4 Bivariate Analysis p. 54

3 Usual process Univariate analysis of each trait. - Identify an appropriate fixed model - Check for outliers and problems with data structure - Sort out fixed model appropriate for each trait - Ensure there is variance at each level: if there is no sire variance in a univariate model, ASReml will not be able to estimate it in a multivariate model ASReml Tutorial: B4 Bivariate Analysis p. 53

4 Output:ANOVA ANOVA NumDF DenDF F-incr Pro 9 Trait < Tr.line at(tr,2).age ASReml Tutorial: B4 Bivariate Analysis p. 52

5 Output:structures Covar/Var/Corr UnStructured Covar/Var/Corr UnStructured ASReml Tutorial: B4 Bivariate Analysis p. 51

6 Output:components Source Model terms Gamma Component C/SE % C Residual UnStru U Residual UnStru U Residual UnStru U Tr.sire UnStru U Tr.sire UnStru U Tr.sire UnStru U ASReml Tutorial: B4 Bivariate Analysis p. 50

7 Output:convergence 1 LogL= S2= df 2 LogL= S2= df 3 LogL= S2= df 4 LogL= S2= df 5 LogL= S2= df 6 LogL= S2= df 7 LogL= S2= df Analysis on Variance scale V = σ 2 (R + ZGZ ) with σ 2 = 1. ASReml Tutorial: B4 Bivariate Analysis p. 49

8 Missing data Multivariate analysis, with US error variance matrix, ASReml will automatically handle missing values in the traits. ASReml Tutorial: B4 Bivariate Analysis p. 48

9 Notes R structure is 65 2 because data is ordered traits within records G structure is 2 9 because Tr.sire means the effects are ordered sires within traits Initial values must be supplied but are often difficult to guess. Specifying them as zeros (3*0) tells ASReml to work out some values from the data. ASReml Tutorial: B4 Bivariate Analysis p. 47

10 1 G Structure ADG WT Trait Tr.line, at(tr,2).age!r Tr.sire # 65 records Trait 0 US 3*0 Tr.sire 2 # <=========== Tr 0 US # <=========== 3*0 # <=========== sire 0 ID # <=========== ASReml Tutorial: B4 Bivariate Analysis p. 46

11 1 R structure ADG WT Trait Tr.line, at(tr,2).age!r Tr.sire # 65 records # <=========== Trait 0 US # <=========== 3*0 # <=========== Tr.sire 2 Tr 0 US 3*0 sire 0 ID ASReml Tutorial: B4 Bivariate Analysis p. 45

12 Variance header line ADG WT Trait Tr.line, at(tr,2).age!r Tr.sire # <=========== 0 # 65 records Trait 0 US 3*0 Tr.sire 2 Tr 0 US 3*0 sire 0 ID ASReml Tutorial: B4 Bivariate Analysis p. 44

13 Bivariate continued Now stack WT effects below ADG effects: u = vec(u) var(u) = Σ C Σ R Essential to get order correct: second term is nested within first. Adding part 3 to the Harvey job: the model!part 3 ADG WT Trait Tr.line, at(tr,2).age!r Tr.sire ASReml Tutorial: B4 Bivariate Analysis p. 43

14 Bivariate Analysis With Harvey data, could analyse ADG and WT - to get two sets of sire effects and two sets of residuals. Consider sire effects (U) in a 9 2 table. Rows are independent: Σ R = I 9 Columns are correlated ( but have ) different S 11 S 12 variances: Σ C = S 21 S 22 ASReml Tutorial: B4 Bivariate Analysis p. 42

15 ASReml tutorial B4 Bivariate Analysis Arthur Gilmour ASReml Tutorial: B4 Bivariate Analysis p. 41

16 Sire model Animal model Solving the model in terms of genetic components can lead to further problems. σ 2 E = σ2 e 3σ 2 s may be negative and not estimable (ASReml requires a positive residual variance) h 2 = 4σ 2 s/(σ 2 e + σ 2 s) is 4 but if the genetic model is correct, should be less than 1. I.e. Our model may not adequately represent the variation in the data leading to unacceptable genetic parameter estimates. ASReml Tutorial: B3 Animal model p. 40

17 Estimability of Components Hendersons method III equated the Sire Mean Square (SMS) to its expectation σe 2 + kσs 2 While SMS 0, σs 2 = (SMS-EMS)/k is -EMS/k In REML, often constrain components to be positive (equivalent to estimating σe 2 after dropping sire from the model). ASReml Tutorial: B3 Animal model p. 39

18 Other genetic components Genetic maternal definition DAM!P and include DAM in the model Permanent environment effect Use ide(animal) Maternal environment effect Use ide(dam) ASReml Tutorial: B3 Animal model p. 38

19 Plot of Residuals Harvey Test data Animal Model Residuals vs Fitted values Residuals (Y) 8.84: 6.95 Fitted values (X) : Apparent mean variance relationship arises because the animal model adds a proportion of the residual (from the sire model) into the fitted value. ASReml Tutorial: B3 Animal model p. 37

20 Plot of Residuals Harvey Test data Animal Model Residuals vs Fitted values Residuals (Y) 8.84: 6.95 Fitted values (X) : ASReml Tutorial: B3 Animal model p. 36

21 Results - Effects Estimate StandErr T-val 5 DamAge line mu animal 74 effects fitted ASReml Tutorial: B3 Animal model p. 35

22 Results - ANOVA ANOVA NumDF DenDF F-incr Prob 9 mu < line DamAge is the same as the Sire model ASReml Tutorial: B3 Animal model p. 34

23 Results - components 5 LogL= S2= df LogL= S2= df LogL= S2= df Final parameter values Source terms Gamma Component C/SE animal Variance ASReml Tutorial: B3 Animal model p. 33

24 Running the model in ASReml!REDO!ARG!? 1=Sire 2=Animal Harvey Test data - Sire and Animal M animal!p sire 9 dam line 3 # Added DamAge ADG Age WT harvey.dat # Pedigree file line a harvey.dat!dopart $1 # Data!PART 1 ADG mu line DamAge!r sire!part 2 ADG mu line DamAge!r animal ASReml Tutorial: B3 Animal model p. 32

25 Variance model Fitting an animal model for the harvey data V = σ 2 E I 65 + σ 2 A ZAZ where Z = ( I 65 ) Thus V simplifies to σ 2 E I 65 + σ 2 A (0.25Z sz s I 65 ) = (σ 2 E σ2 A )I σ 2 A Z sz s which is exactly the same as under the sire variance model. ASReml Tutorial: B3 Animal model p. 31

26 reducing to A 1 i = ( A 1 + pqp qp pq q ) where p is zero except for two 1 2 s in parental rows, q = (1 + f i p Ap) 1 = (1 (a s,s + a d,d )/4) 1 so that it just requires keeping diag(a). For the case of a sire model (dams unknown, sires ( not inbred), ) I 9 0.5Z s A = 0.5Z s 0.25Z s Z s I 65 ASReml Tutorial: B3 Animal model p. 30

27 Relationship Matrix The diagonal of the relationship matrix (a i,i ) is 1 + f where f = a s,d /2 is the inbreeding coefficient. The relationship of an animal with other animals is the average of its parental values. When parents are listed before progeny, this gives a straight forward way to calculate relationships. However, the inverse relationship matrix is in fact easier to calculate and more sparse. ASReml Tutorial: B3 Animal model p. 29

28 ASReml tutorial B3 Animal model Arthur Gilmour ASReml Tutorial: B3 Animal model p. 28

29 Line+Sire predict Sire!present Sire Line E E E E E E E Overall Stnd Error of Diff ASReml Tutorial: B2 Sire Model p. 27

30 Line+Sire predict Sire!present Sire Line Line is average of combinations present DamAge is evaluated at Sire Pred_Value Stand_Error Ecode E E E E E E ASReml Tutorial: B2 Sire Model p. 26

31 Predict predict Line Predicted values of ADG DamAge evaluated at average value 4. Sire is ignored in the prediction Line Predicted_Value Stand_Error Ec E E E Overall Stnd Error of Diff ASReml Tutorial: B2 Sire Model p. 25

32 Fixed effects Term Level Effect SE DamAge Line Line Line mu Notes: Terms are in reverse order (ASReml solves from bottom) Line-1 effect is singular. ASReml Tutorial: B2 Sire Model p. 24

33 ANOVA Degrees of Freedom and Stratum Variances ANOVA NumDF DenDF F-incr Prob 9 mu < Line DamAge Damage is NS; Line is significant tested against Sire variance. ASReml Tutorial: B2 Sire Model p. 23

34 Sire BLUPS from the.sln file sum to zero within lines Sire E Sire Sire Sire Sire Sire E Sire Sire Sire ASReml Tutorial: B2 Sire Model p. 22

35 Genetic parameters Notice: The parameter estimates are approximate standard errors 3 PhenVar GenVar Heritability = GenVar 4/PhenVar 3 = followed by their ASReml Tutorial: B2 Sire Model p. 21

36 Genetic components Create a PIN file (harvey.pin) # 1 is Sire component # 2 is Residual F PhenVar 1 2 #3 is Sire + Residual F GenVar 1*4. #4 is Sire x 4.0 H Herit 4 3 #Heritability is GenVar/Phen Run using ASReml -p harvey This extracts the variance components from the.asr file and their variances from the.vvp file and computes the requested quantities ASReml Tutorial: B2 Sire Model p. 20

37 Components 5 LogL= S2= df Source terms Gamma Component Comp/SE % C Sire P Variance P Notice γ = , σ 2 e = , σ 2 s = γσ 2 e = ASReml Tutorial: B2 Sire Model p. 19

38 Random design Z has 9 columns being zeros except for s respectively indicating which sire The variance model is σ 2 e (I + γzz ) where σ 2 s = γσ2 e The genetic model σ 2 A = 4σ2 s ; σ2 s = 0.25σ2 A σ 2 E = σ2 e 3σ2 s ; σ2 e = σ2 E σ2 A ASReml Tutorial: B2 Sire Model p. 18

39 Fixed Design X has 5 columns mu is a column of ones line-1 has 21 1 s, 15 0 s, 29 0 s line-2 has 21 0 s, 15 1 s, 29 0 s line-3 has 21 0 s, 15 0 s, 29 1 s DamAge (covariate) has vector of dam ages This design has 1 singularity because the three line columns sum to give the mu column. ASReml will set τ 2 = 0 ASReml Tutorial: B2 Sire Model p. 17

40 Summary Model term Size #mv #00 MinNon0 Mean MaxNon0 1 ID Sire Dam Line DamAge ADG Variate Age InitialWT ASReml Tutorial: B2 Sire Model p. 16

41 2.2 Sire model Harvey Test data - Sire Model animal sire 9 dam line 3 DamAge ADG Age WT harvey.dat ADG mu line DamAge!r sire ASReml Tutorial: B2 Sire Model p. 15

42 Harvey.dat summary 9 sires representing 3 sire lines (1 2 3) (4 5) ( ) records (65) Data set originally distributed with Harvey s program ASReml Tutorial: B2 Sire Model p. 14

43 Harvey.dat animal sire dam line DamAge ADG Age WT ASReml Tutorial: B2 Sire Model p. 13

44 ASReml tutorial B2 Sire Model Arthur Gilmour ASReml Tutorial: B2 Sire Model p. 12

45 The challenge to define X Z R and G to obtain the desired analysis. R = σ 2 I G i = σ 2 γ i I i Often several ways of writing equivalent models. ASReml Tutorial: B1 A matrix refresher p. 11

46 Differentiation l R = (log C + log R + log G + νlogσ 2 + y P y/σ 2 )/2 l R / φ i = ( C i C Z Z tr(g i G 1 ) + 0 y P y i /σ 2 )/2 y i = ZG i G 1 ũ l R / κ j = ( C j C 1 + tr(r j R 1 ) y P y j /σ 2 )/2 y j = R j R 1 η ASReml Tutorial: B1 A matrix refresher p. 10

47 Two forms V = σ 2 (R + ZGZ ) default for univariate single site analyse. R defined as a correlation matrix G defined as a variance ratio V = R + ZGZ used for multivariate and multisite analyses. ASReml Tutorial: B1 A matrix refresher p. 9

48 REML Let C = ( X R 1 X Z R 1 X X R 1 Z Z R 1 Z + G 1 ) P = R 1 R 1 W C 1 W R 1 l R = (log C + log R + log G + νlogσ 2 + y P y/σ 2 )/2 ASReml Tutorial: B1 A matrix refresher p. 8

49 Mixed model equations Mixed model ( y = Xτ + Zu + ɛ X R 1 X X R 1 Z Z R 1 X Z R 1 Z + G 1 ( X R 1 y Z R 1 y ) ) ( τ u ) = ASReml Tutorial: B1 A matrix refresher p. 7

50 Matrix operations Matrix multiplication must be conformable ( ) A ( ) a b c aa + bb + cc B = d e f da + eb + fc C Direct ( ) product a [A B C] = b ( aa ab ac ba bb bc ) ASReml Tutorial: B1 A matrix refresher p. 6

51 Matrix operations Transpose [a b c] = a b c Addition - matrices of the same order are added element by element [1 2] + [3 4] = [4 6] Multiplication by scalar 3[1 2] = [3 6] ASReml Tutorial: B1 A matrix refresher p. 5

52 Some matrices A matrix is a rectangular array of numbers X is the design matrix for fixed effects Z is the design matrix for random effects W = [X Z] is the whole design matrix G =var(u) R =var(ɛ) A is a relationship matrix ASReml Tutorial: B1 A matrix refresher p. 4

53 Some vectors A vector is a column of numbers y is the response variable ˆτ is the fixed effects ũ is the random effects ɛ is the residuals ASReml Tutorial: B1 A matrix refresher p. 3

54 ASReml tutorial B1 A matrix refresher Arthur Gilmour ASReml Tutorial: B1 A matrix refresher p. 2

55 ASReml tutorial B1 A matrix refresher Arthur Gilmour ASReml Tutorial: B1 A matrix refresher p. 1

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