BlaAlt: Pairs of measurements of forced expiratory volume

In pvrank: Rank Correlations

Description

A problem with the use of the correlation coefficient between the first and second measurements is that there is no reason to suppose that their order is important. If the order were important the measurements would not be repeated observations of the same thing. We could reverse the order of any of the pairs and get a slightly different value of the correlation coefficient between repeated measurements.

Usage

data(BlaAlt)

Format

A data frame with 20 observations on the following two variables.

Fev1

First FEV (litres).

Fev2

Second Fev (litres).

Details

Pairs of measurements of forced expiratory volume (litres) a few weeks apart from 20 Scottish school children.

Source

Bland, M. J. and Altman, D. G. (1996). "Measurement error and correlation coefficients". BMJ: British Medical Journal, 313, 41–42.

Examples

	data(BlaAlt)
	head(BlaAlt)

pvrank documentation built on May 17, 2018, 9:03 a.m.