The detectability of breakdown of linear response is linked to the amount of available data. As N → ∞, a breakdown will always become detectable at any specified significance level α. Conversely, if the mismatch Eq between the true response of the dynamical system and the linear response is too small and there is an insufficient amount of **data** available, the actual response will be swamped by the sampling noise, and one will not be able to detect the breakdown of linear response with a reasonable significance level.