This is not robust to outliers. See for instance: http://correlate.googlelabs.com/search?e=payday&e=payday%20loan&t=weekly http://correlate.googlelabs.com/searc

This is not robust to outliers. See for instance: http://correlate.googlelabs.com/search?e=payday&e=payday%20loan&t=weekly http://correlate.googlelabs.com/search?e=payday&e=payday... Maybe they could use a different (and probably more computationally intensive) correlation to fix this.