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Effects of dietary protein on free plasma leucine concentration in pigs

Source: R/datasets.R
pigs.Rd

A two-factor experiment with some observations lost

Usage

pigs

Format

A data frame with 29 observations and 3 variables:

source

Source of protein in the diet (factor with 3 levels: fish meal, soybean meal, dried skim milk)

percent

Protein percentage in the diet (numeric with 4 values: 9, 12, 15, and 18)

conc

Concentration of free plasma leucine, in mcg/ml

Source

Windels HF (1964) PhD thesis, Univ. of Minnesota. (Reported as Problem 10.8 in Oehlert G (2000) A First Course in Design and Analysis of Experiments, licensed under Creative Commons, http://users.stat.umn.edu/~gary/Book.html.) Observations 7, 22, 23, 31, 33, and 35 have been omitted, creating a more notable imbalance.

Examples

  pigs.lm <- lm(inverse(conc) ~ source + factor(percent), data = pigs)
  emmeans(pigs.lm, "source")
#>  source emmean       SE df lower.CL upper.CL
#>  fish   0.0337 0.000926 23   0.0318   0.0356
#>  soy    0.0257 0.000945 23   0.0237   0.0276
#>  skim   0.0229 0.000994 23   0.0208   0.0249
#> 
#> Results are averaged over the levels of: percent 
#> Results are given on the inverse (not the response) scale. 
#> Confidence level used: 0.95