- Replication (statistics)
engineering, science, and statistics, replication is the repetition of an experimental condition so that the variability associated with the phenomenon can be estimated. ASTM, in standardE1847, defines replication as "the repetition of the set of all the treatment combinations to be compared in an experiment. Each of the repetitions is called a replicate."
Replication is not the same as repeated
measurements of the same item: they are dealt with differently in statistical experimental designand data analysis.
sampling, a process or batch of products should be in reasonable statistical control; inherent randomvariation is present but variation due to assignable (special) causes is not. Evaluation or testing of a single item does not allow for item-to-item variation and may not represent the batch or process. Replication is needed to account for this variation among items and treatments.
As an example, consider a continuous process which produces items. Batches of items are then processed or treated. Finally, tests or measurements are conducted. Several options might be available to obtain ten test values. Some possibilities are:
* One finished and treated item might be measured repeatedly to obtain ten test results. Only one item was measured so there is no replication. The repeated measurements help identify
* Ten finished and treated items might be taken from a batch and each measured once. This is not full replication because the ten samples are not random and not representative of the continuous nor batch processing.
* Five items are taken from the continuous process based on sound statistical sampling. These are processed in a batch and tested twice each. This includes replication of initial samples but does not allow for batch-to-batch variation in processing. The repeated tests on each provide some measure and control of testing error.
* Five items are taken from the continuous process based on sound statistical sampling. These are processed in five different batches and tested twice each. This plan includes proper replication of initial samples and also includes batch-to-batch variation. The repeated tests on each provide some measure and control of testing error.
Each option would call for different
data analysismethods and yield different conclusions.
design of experiments
Degrees of freedom (statistics)
Statistical process control
ASTME122-07 Standard Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process
* "Engineering Statistics Handbook", NIST/SEMATEK, [http://www.itl.nist.gov/div898/handbook/]
* Pyzdek, T, "Quality Engineering Handbook", 2003, ISBN 0824746147
* Godfrey, A. B., "Juran's Quality Handbook", 1999, ISBN 007034003
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