Signal:
The signal is the component of the observed data (e.g. of a time series ) that carries useful information. The complementary (opposite) concept is noise .
In a narrower sense (e.g. in signal processing ) signals are functions of time, as opposed to fields (functions of spatial coordinates) or images.
Planning on taking an introductory statistics course, but not sure if you need to start at the beginning? Review the course description for each of our introductory statistics courses and estimate which best matches your level, then take the self test for that course. If you get all or almost all the questions correct, move on and take the next test.
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