Coefficient of variation from duplicate measurements

Command

Statistics Method comparison & evaluation Coefficient of variation from duplicate measurements

Description

The calculation of the Standard Deviation (SD) and Coefficient of Variation (CV) from duplicate measurements made on a number of different subjects or materials is used to determine the reproducibility of the measurements as an alternative to making a large number of observations on a single subject or material to calculate the SD and CV directly (Jones & Payne 1997).

Required input

In the dialog box you select the variables that contain the data for the two measurements. The order is not important.

Results

With n being the number of data pairs and x₁ and x₂ duplicate measurements, the SD, Mean and CV are given by:

Literature

• Jones R, Payne B (1997) Clinical investigation and statistics in laboratory medicine. London: ACB Venture Publications.