Trend detection in control data: Optimization and interpretation of Trigg's technique for trend analysis
Cembrowski GS, Westgard JO, Eggert AA, Toren EC Jr. Trend detection in control data: optimization and interpretation of Trigg's technique for trend analysis. Clin Chem 1975;21:1396-405.
The EWMA control chart: Properties and comparison with other quality-control procedures by computer simulation
Neubauer AS. The EWMA control chart: properties and comparison with other quality-control procedures by computer simulation. Clin Chem 1997;43:594-601.
Internal quality control system for non-stationary, non-ergodic analytical processes based upon exponentially weighted estimation of process means and process standard deviation
Jansen RT, Laeven M, Kardol W. Internal quality control system for non-stationary, non-ergodic analytical processes based upon exponentially weighted estimation of process means and process standard deviation. Clin Chem Lab Med 2002;40:616-24.
Mean and variance rules are more powerful or selective than quality control rules based on individual values
Linnet K. Mean and variance rules are more powerful or selective than quality control rules based on individual values. Eur J Clin Chem Clin Biochem 1991;29:417-24.