General Report on Tunny
25E Page 168
(b) Runs for ΔΧ2 and Χ2
In a run for ΔΧ2 however, the scores for all characters of ΔΧ2 will appear, those where Χ2 = x scoring strongly, those where Χ2 = . weakly, so that the run provides two types of evidence:
(i) high and low scores indicate Χ2 = x and .,
(ii) positive and negative scores indicate ΔΧ2 = . and x, moreover the Χ2, and ΔΧ2 obtained by differencing, must be consistent.
Scores against Χ2 = x and Χ2 = . must be decibanned separately, the result of which is usually that scores against Χ2 = . are found to be negligible. Until a complete Χ2 can be found the best plan is to ignore all but strong characters.
(c) "Working out the limitation".
It is often possible to find a complete or nearly complete Χ2 at an early stage, even straight from the rectangle. It is justifiable to assume Χ2 limitation if there are many high scores and many low scores for ΔΧ2 characters, but few moderate ones.
An easy example of this is:
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