**Definition:** Time series is a sequence of data points ordered in time. Typically, the parameter/variable is sampled at regular time intervals, t , which defines a sampling frequency, fs, given by fs=1/t. For instance, in fNIRS, the intensity detected at a detector coming from a light source defines a time series for the light intensity at a source-detector pair.Definition: Time series is a sequence of data points ordered in time. Typically, the parameter/variable is sampled at regular time intervals, t , which defines a sampling frequency, fs, given by fs=1/t. For instance, in fNIRS, the intensity detected at a detector coming from a light source defines a time series for the light intensity at a source-detector pair.

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**References:** https://doi.org/10.1145/2379776.2379788

**Related terms:** Time courses; Sampling frequency, Signal, Time points, Statistical Analysis, Channel