Statistical Methods in Medical Research by Charan Singh Rayat

Author:Charan Singh Rayat
Language: eng
Format: epub, pdf
ISBN: 9789811308277
Publisher: Springer Singapore

9.5 Yates’ Correction

The χ 2 test is applied to discrete variables to ascertain the association between these. Yates, F. in 1934 has given a method to be applied when expected frequency/value in any cell of “two-by-two” (2 × 2) contingency table is less than 5. Correction is done in the formula for total number of observations. Half of the number of observations () is subtracted from the absolute value of “ac−bd” before taking square and multiplying with N as illustrated here under with reference to data for vaccinated and non-vaccinated people arranged in Table 9.6 as Example 1 for Yates’ correction.

Formula without Yates’ correction:

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