Enzyme activity data

Three measurement of enzyme activity on 24 patients. The measurements is of the enzymes sucrase and alkaline phosphatase. The interest is to compare the 'homogenate' and 'pellet' methods.

Format

A data frame with 72 observations on the following 3 variables.

meth

a factor with levels SucHom SucPel Alkphos, representing three different measurements, i.e. homogenate and pellet values of sucrase, as well as homogenate values of alkaline.

item

a numeric vector, the person ID for the 24 patients

y

a numeric vector, the measurements on the enzyme activity.

Source

R. L. Carter; Restricted Maximum Likelihood Estimation of Bias and Reliability in the Comparison of Several Measuring Methods; Biometrics, Dec., 1981, Vol. 37, No. 4, pp. 733-741.

Examples

data(Enzyme)
Enzyme <- Meth( Enzyme )
#> The following variables from the dataframe
#> "Enzyme" are used as the Meth variables:
#> meth: meth 
#> item: item  
#>    y: y 
#>           #Replicates
#> Method             1 #Items #Obs: 72 Values:  min    med    max
#>   SucHom          24     24       24         6.50  54.86 115.15
#>   SucPel          24     24       24        18.87 135.65 331.50
#>   Alkphos         24     24       24         7.21 121.97 231.89
summary( Enzyme )
#>           #Replicates
#> Method             1 #Items #Obs: 72 Values:  min    med    max
#>   SucHom          24     24       24         6.50  54.86 115.15
#>   SucPel          24     24       24        18.87 135.65 331.50
#>   Alkphos         24     24       24         7.21 121.97 231.89
# plot( Enzyme )