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Bias in estimation of error in change-over trials with dairy cattle

Published online by Cambridge University Press:  27 March 2009

H. L. Lucas
H. L. Lucas
Affiliation:
Institute of Statistics, University of North Carolina Raleigh, North Carolina, U.S.A.
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Extract

A study has been made of the bias in error which occurs when Latin-square change-over trials conducted on dairy cattle are analysed by the usual method for Latin-square experiments, with modification for carry-over effects. Bias is present for adjusted direct effects and for permanent effects (direct plus carry-over), but does not exist for unadjusted direct effects.

Analyses of fifteen sets of experimental data showed that the bias is of no importance in 3 × 3 designs but might be serious for some practical situations in the 4 × 4 designs. A tentative factor to correct for bias was given for the latter case.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 41 , Issue 1-2 , January 1951 , pp. 146 - 148
Copyright
Copyright © Cambridge University Press 1951

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References

REFERENCES

Cochran, W. G., Autrey, K. M. & Cannon, C. Y. (1941). J. Dairy Sci. 24, 937.Google Scholar
Patterson, H. D. (1950). J. Agric. Sci. 40, 375.CrossRefGoogle Scholar
Williams, E. J. (1949). Aust. J. Sci. Res. A, 2, no. 2, 149.Google Scholar