Case study 3: Exploratory analysis of factors affecting weaning weight of Dorper and Red Maasai lambs

Reporting

By applying this formula to each factor the table can be written as shown. Here it is particularly important to give the numbers of lambs for each factor level so as to be able to gauge how approximate the S.E.D. is when applied to each level of a factor.

Same table of means but with standard errors of differences between means

Parameter
No.

Mean

Genotype

       Dorper (D)
220

11.56

       Red Maasai (R)
181

10.51

       RXD
198

11.16

       DXR
101

11.04

Average S.E.D
0.28

Year

       1991

144

12.73

       1992

109

11.16

       1993

168

11.63

       1994

79

9.91

       1995

107

9.53

       1996

93

10.39

Average S.E.D.
0.33

Sex

       Female
323

10.84

       Male
377

11.32

Average S.E.D.
0.17