Observations
How many matched returns a statistic was computed from.
How to read it
The fewer there are, the less a correlation can be trusted: with 30, a 95% interval around a correlation of zero runs from about −0.36 to +0.36.
In Kereon
Charts · Correlation. The periods both instruments have a close inside the lookback. A pair with fewer than 15 is left blank; with fewer than 30 the page says how wide its interval is.
Also called: observations.