external validation

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What do you think “external validation”? Most researchers misunderstand “external validation” is validation for unknown data. It is outside of science. So, we ...
External Validation What do you think “external validation”? Most researchers misunderstand “external validation” is validation for unknown data. It is outside of science. So, we assume the training sample is well sampled from the population. If we admit this loose assumption, we can use re-sampling or bootstrap method. We developed the “k-fold cross validation for small sample” method. I apply this method for many real data sets. If I apply this method to tiny data such as student data, the validation is not reliable. But, we apply this method for the iris data, Swiss banknote data, etc., the results are reliable. See my papers about the comparisons of eight LDFs by this method and mean of error rates in the validation samples.

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