ox: Measurement of oxygen saturation in blood

In MethComp: Analysis of Method Comparison studies

Description

61 children had their blood oxygen content measured at the Children's Hospital in Melbourne, either with a chemical method analysing gases in the blood (CO) or by a pulse oximeter measuring transcutaneously (pulse). Replicates are linked between methods; i.e. replicate 1 for each of the two methods are done at the same time. However, replicate measurements were taken in quick succession so the pairs of measurements are exchangeable within person.

Usage

data(ox)

Format

A data frame with 354 observations on the following 4 variables.

meth

Measurement methods, factor with levels CO, pulse

item

Id for the child

repl

Replicate of measurements. There were 3 measurements for most children, 4 had only 2 replicates with each method, one only 1

y

Oxygen saturation in percent.

Examples

data(ox)
str(ox)
ox <- Meth(ox)
with( ox, table(table(item)) )
summary( ox )
# The effect of basing LoA on means over replicates:
par( mfrow=c(1,2), mar=c(4,4,1,4) )
BA.plot(      ox , diflim=c(-20,20), axlim=c(20,100), repl.conn=TRUE )
BA.plot( mean(ox), diflim=c(-20,20), axlim=c(20,100) )

MethComp documentation built on May 2, 2019, 5:06 p.m.