Results from an inter-laboratory study involving \(k = 28\) measurements for the level of arsenic in oyster tissue. y
is the mean level of arsenic from a lab and se
is the standard error of the measurement.
data("arsenic")
A data frame of \((y_i, se_i)\) for \(i = 1,...,28\).
y
mean level of arsenic in the tissue measured by the \(i^{th}\) lab
se
the standard error of the measurement by \(i^{th}\) lab