Appendlx--Calculation of Probability of Misclassification 



Calculation of the probability^) of assigning a fish to the wrong sample of two possible 

 samples based on counted characters is accomplished in the following steps (Royce, 1957): 



1. D= ^1 -''2 



^P 



Where D is the distance between the means xj^and Xj in units of the standard 

 deviation, and Sp is the square root of the pooled variances. 



D 



The probability P^^ of having a "t" value as large as a calculated "t" where "t" = -^ 



with n^ + n2 degrees of freedom is determined from a table of "t" values. 



p 

 The probability of misclassification (p) = } and ranges from 0.00 indicating no 



chance of misclassification to 0.50 indicating a 50:50 chance of misclassification 



and representing complete overlap of the two samples for the character in question. 



11 3i50M 



