Set up one scenario, vary a few fields across up to four columns, and see side by side where testing separates the accounts and where it does not.
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Step 1
The base scenario
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Step 2
Base, held constant
Columns:Two to four columns.
Give each column a short title and change only the fields that differ. Everything else stays as the base.
Each column runs a full report, so this takes up to a minute and costs a few cents per column.
Step 3
Comparison
Counsel preparation only. Not expert evidence. Procedures are those of US public laboratories and the ENFSI guideline; a Canadian laboratory's method may differ.