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As compared to a single test set, double cross-validation provided a more realistic picture of model quality and should be preferred over a single test set.
Since the magnitude of the prediction error (PE) depends on the data set size, double cross-validation estimates the prediction error for n train and not for n = n train + n test.
Everyone but Walker can see that he's being set up for a double cross when this young temptress asks him to trace her late husband's illegitimate progeny so they can share the wealth.
The predictive ability of the OPLS-DA models built on the homogeneous subsets were compared to the model based on the whole data set, using 7-fold and double cross-validation Q. Permutation tests were calculated by randomly assigning classes to the samples, and remodelling was repeated 50 times.
Double Cross, by Ben Macintyre (Crown).
Somewhere in the fog, perhaps, there was a double cross.
There is one magnificent moment in Double Cross.
(That's "double cross" not "XX," by the way).
Then double cross them and take their resources.
Also, it appears the sequel is already titled Double Cross.
They are what they always are: a double cross.
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