pub fn cabbages() -> Result<DataFrame, PolarsError>Expand description
§Data from a cabbage field trial
§Description:
The ‘cabbages’ data set has 60 observations and 4 variables
§Usage:
cabbages
§Format:
This data frame contains the following columns:
- ‘Cult’ Factor giving the cultivar of the cabbage, two levels: ‘c39’ and ‘c52’.
- ‘Date’ Factor specifying one of three planting dates: ‘d16’, ‘d20’ or ‘d21’.
- ‘HeadWt’ Weight of the cabbage head, presumably in kg.
- ‘VitC’ Ascorbic acid content, in undefined units.
§Source:
Rawlings, J. O. (1988) Applied Regression Analysis: A Research Tool. Wadsworth and Brooks/Cole. Example 8.4, page 219. (Rawlings cites the original source as the files of the late Dr Gertrude M Cox.)
§References:
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S-PLUS. Fourth Edition. Springer.