begonia: Begonia Pot Plant Quality Scores
In repolr: Repeated Measures Proportional Odds Logistic Regression

Description Usage Format Source Examples

Begonia pot plant quality scores (for 2 varieties and 3 transport chains), during 5 weeks in simulated shelf-life conditions (temperature, light and irrigation). Quality scores were originally made on an ordinal scale from 1 to 10 (highest quality). However, only categories 2 to 9 were used, so these were re-coded to scale from 1 to 8. In addition to overall quality scores, a range of plant physiological characteristics were also observed.

1	data(begonia)

A data frame with 720 observations on the following variables.

Pot: pot plant identifier; 1 to 144.
Plot: location in growing compartment; 1 to 48.
Week: week number in simulated shelf-life; 1 to 5.
Temp: temperature in compartment; 16C or 21C.
Light: light level in compartment; High or Low.
Chain: transport chain; Cold, Comm (commercial) or Optm (optimum).
Irrig: irrigation in compartment; Cont (control) or Fluct (fluctuating).
Variety: variety; Balli or Batik.
Qual: quality score; 1 to 8.
FDrop: count of dropped flowers.
CBDrop: count of dropped coloured buds.
GBDrop: count of dropped green buds.
FDam: count of damaged flowers.
FSing: count of single flowers.
FDoub: count of double flowers.
LYell: count of yellow leaves.

Parsons NR, Edmondson RN, Gilmour SG. A generalized estimating equation method for fitting autocorrelated ordinal score data with an application in horticultural research. Journal of the Royal Statistical Society C 2006; 55:507-524.