Samples of effluent were divided and sent to two laboratories for testing. Data are measurements of biochemical oxygen demand and suspended solid measurements obtained for 2 sample splits from the two laboratories.
A data frame with 11 observations on the following 4 variables.
biochemical oxygen demand measurements from commercial laboratory
suspended solids measurements from commercial laboratory
biochemical oxygen demand measurements from state laboratory
suspended solids measurements from state laboratory
Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.
Johnson, R.A. and Wichern, D.W. (1988). Applied Multivariate Statistical Analysis, Prentice-Hall.