A circuit is described for the measurement of a correlation coefficient between two continuous signals. The method depends on an accurate mean square element which is obtained through the i2r heating of a thermistor. Relatively simple circuit features give accuracy to about 1 percent, even though the resistance of the thermistor varies by about 25 percent between zero and full input.

Topics
Resistors, Covariance and correlation
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© 1953 American Institute of Physics.
1953
American Institute of Physics
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