Peak Expiratory Flow Rate (PEFR) measurements with Wright peak flow and mini Wright peak flow meter.

Measurement of PEFR with Wright peak flow and mini Wright peak flow meter on 17 individuals.

Format

A data frame with 68 observations on the following 3 variables.

meth

a factor with levels Wright and Mini, representing measurements by a Wright peak flow meter and a mini Wright meter respectively, in random order.

item

Numeric vector, the person ID.

y

Numeric vector, the measurements, i.e. PEFR for the two measurements with a Wright peak flow meter and a mini Wright meter respectively. The measurement unit is l/min.

repl

Numeric vector, replicate number. Replicates are exchangeable within item.

Source

J. M. Bland and D. G. Altman (1986) Statistical Methods for Assessing Agreement Between Two Methods of Clinical Measurement, Lancet. 1986 Feb 8;1(8476):307-10.

Examples

data(PEFR)
PEFR <- Meth(PEFR)
#> The following variables from the dataframe
#> "PEFR" are used as the Meth variables:
#> meth: meth 
#> item: item 
#> repl: repl 
#>    y: y 
#>          #Replicates
#> Method            2 #Items #Obs: 68 Values:  min   med max
#>   Mini           17     17       34          227 444.5 658
#>   Wright         17     17       34          165 432.0 656
summary(PEFR)
#>          #Replicates
#> Method            2 #Items #Obs: 68 Values:  min   med max
#>   Mini           17     17       34          227 444.5 658
#>   Wright         17     17       34          165 432.0 656
plot(PEFR)

plot(perm.repl(PEFR))