In the following paragraph:
This plot is a stray evidence of how Pearson correlation coefficient is often incomputable and hence ineffective.
What does the expression "a stray evidence" mean?
Could you give some more examples?
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A stray evidence refers to a piece of evidence that wasn't necessarily tied closely in to the subject. One of Dictionary.com's definitions of stray is:
10. found or occurring apart from others or as an isolated or casual instance; incidental or occasional.