From: I M S White <iwhite_at_STAFFMAIL.ED.AC.UK>

Date: Wed, 9 Feb 2005 10:32:11 +0000

Date: Wed, 9 Feb 2005 10:32:11 +0000

Dear ASRemlers,

Given two groups, n1 (x,y) pairs in one group, n2 in the other, is this

the way to predict the difference between regression lines? Is there a

more straightforward way? Why does ASReml think these predictions are

non-estimable? (I want to generalize to higher degree polynomials, hence

use of pol).

group 2

x

y

test.dat

y ~ p(x,1) group.p(x,1)

predict line 2 p(x,1) !onlyuse group.p(x,1) !printall

test.dat looks like this:

1 1 10.01

1 2 10.8

1 3 14.5

1 4 14.6

1 5 16.58

1 6 15.25

1 7 17.89

1 8 18.97

1 9 18.65

1 10 19.95

2 1 2.39

2 2 5.72

2 3 4.16

2 4 7.24

2 5 9.28

2 6 10.5

2 7 10.67

2 8 14.27

2 9 16

2 10 15.56

======================================

I.White

University of Edinburgh

Ashworth Laboratories, West Mains Road

Edinburgh EH9 3JT

Tel: 0131 650 5490 Fax: 0131 650 6564

E-mail: iwhite_at_staffmail.ed.ac.uk

======================================

Received on Tue Feb 09 2005 - 10:32:11 EST

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