Recently I saw that there is a new Computational Science SE site and it seems to overlap considerably with scientific and statistical computing. Those questions seem to be welcomed on both sites. How do I distinguish where each question goes?
For a motivating example, I recently came up with a question where I couldn't figure out which site was appropriate. I wanted to compare scipy's implementation of PCA with my own. (The question can be found here.) How would I know if this question was better for Cross Validated or computational science?
(Note that I ended up submitting it to Stack Overflow even before these two sites occurred to me. That may have been a mistake on my part. Feel free to contribute more or better examples to distinguish where questions go where.)