skin {sanon}

Skin Condition Data

Description

The data are from a randomized clinical trial to compare a test treatment to placebo for skin conditions, and listings of the data appear in Stanish, Gillings, Koch (1978a, b). The variables are as follows:

Usage

data(skin)

Format

A data frame with 172 observations and 6 variables.

Details

center

a factor vector for two centers

treat

a factor with levels A and P for active and placebo treatments, skinectively

stage

a numeric vector for initial severity of the skin condition according to 3 categories (3 = fair, 4 = poor, 5 = exacerbation) at baseline measurement

res1

a numeric vector for extent of improvement at visit 1 according to 5 categories (1 = rapidly improving, 2 = slowly improving, 3 = stable, 4 = slowly worsening, 5 = rapidly worsening)

res2

a numeric vector for extent of improvement at visit 2 with same categories as res1

res3

a numeric vector for extent of improvement at visit 3 with same categories as res1

References

Stanish W, Gillings D, Koch G (1978a). "An application of multivariate ratio methods for the analysis of a longitudinal clinical trial with missing data." Biometrics, 34(2), pp. 305–317.

Stanish WM, Koch GG, Landis JR (1978b). "A computer program for multivariate ratio analysis (MISCAT)." Computer Programs in Biomedicine, 8(3-4), 197–207.