pub fn immer() -> Result<DataFrame, PolarsError>Expand description
§Yields from a Barley Field Trial
§Description:
The ‘immer’ data frame has 30 rows and 4 columns. Five varieties of barley were grown in six locations in each of 1931 and 1932.
§Usage:
immer
§Format:
This data frame contains the following columns:
- ‘Loc’ The location.
- ‘Var’ The variety of barley (‘“manchuria”’, ‘“svansota”’, ‘“velvet”’, ‘“trebi”’ and ‘“peatland”’).
- ‘Y1’ Yield in 1931.
- ‘Y2’ Yield in 1932.
§Source:
Immer, F.R., Hayes, H.D. and LeRoy Powers (1934) Statistical determination of barley varietal adaptation. Journal of the American Society for Agronomy 26, 403-419.
Fisher, R.A. (1947) The Design of Experiments. 4th edition. Edinburgh: Oliver and Boyd.
§References:
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S-PLUS. Fourth Edition. Springer.
§Examples:
immer.aov <- aov(cbind(Y1,Y2) ~ Loc + Var, data = immer)
summary(immer.aov)
immer.aov <- aov((Y1+Y2)/2 ~ Var + Loc, data = immer)
summary(immer.aov)
model.tables(immer.aov, type = "means", se = TRUE, cterms = "Var")