lip {gamlss.cens} | R Documentation |
The data set used in this package are collected by Dr Peggy Braun (University of Leipzig) and passed on to use by professor Jane Sutherland of London Metropolitan University.
It consists of experimental enzymology results from a research project which attempted to develop a generic food spoilage model.
The data set contains a column called NAMES, which shows the experiment name,
three columns with values of the environmental conditions: temperature (Tem
),
pH
and water activity (aw
), and the rest of the columns
contains the activity of the cocktails, observed at certain days.
The researchers recorded the activity of proteases and lipases in each cocktail and were interested in predicting the time when the activity started given the environmental conditions. The activity is a positive integer and enzymes are considered inactive when activity=0.
data(lip)
A data frame with 120 observations on the following 14 variables.
name
Tem
pH
aw
X0.d
X1.d
X2.d
X4.d
X11.d
X18d.
X25.d
X32.d
X39.d
y
Surv()
object indicating the start the finish and censored indicator as defined in
function Surv()
of survival.Prof. Jane Sutherland, London Metropolitan University
data(lip) with(lip, y)