This preview shows page 1. Sign up to view the full content.
Unformatted text preview: Historically, statisticians used a rule of thumb of an F ratio (experimental error divided by sampling error) that was not only not significant, but was also less than about 1.7. This ratio indicates that the numerator error term was less than 70% larger than the denominator error term. In 1983 two authors (Bancroft and ChienPai) published the table below as an improvement on this rule of thumb. We will use this as our criteria for pooling error terms. Pooling criteria by Bancroft and ChienPai (JASA,1983, 78(384):981983). Values are P(>F). Pool if equal to or larger than the values in the table. n 1 = 4 8 12 16 20 n 2 = 4 0.35 0.43 0.45 0.48 0.48 8 0.29 0.37 0.40 0.43 0.43 12 0.26 0.34 0.37 0.40 0.41 16 0.25 0.32 0.36 0.38 0.39 20 0.24 0.31 0.34 0.38 0.38 n 1 and n 2 are degrees of freedom for the numerator and denominator...
View Full
Document
 Fall '08
 Wang,J

Click to edit the document details