Determination of Outlier in Live-Weight performance data of Japanese Quails (Coturnix coturnix japonica) by Dffits and Cook’s Distance
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Date
2015-03-18Author
İnci, Hakan
Bahadır, Burhan
Karadavut, Ufuk
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The data on live weight performance usually show a normal distribution. On the other hand, the majority of
the statistical analysis methods have been developed on the basis of the assumption that the data under consideration
are normally distributed. From time to time, in the analysis of the obtained numerical values, one or more observation
is found to be quite far away from other observations. Such values are named as extreme value, deviated value, and
outlier value. This study has been carried out by using Cook's distance and DFFITS criteria, with intent to determine
the outliers of the live weight performance data of the Japanese quails, which has been classified according to their sex
and have grown until the age of 70 days (10 weeks). In conclusion, it can be said that the DFFITS values are higher
than COOK’s distance in male, female, and flock total. DFFITS method is a method that finds more outlier values
when compared to COOK’s distance method in terms of finding outlier. DFFITS method should be used if precision is
wanted to be enhanced, and COOK’s distance method should be preferred in less precision studies.
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