# Impulse-response function

The **impulse response function** , and **pulse response function** ( English *impulse response function* ) determined in the context of time series analysis , the type and duration, in using the pulse , which at a certain time *t* occurs, affects subsequent time series values. The momentum-response function can be used as a lag polynomial in the rational form:

to be brought. The exponent *d* describes the delay time that elapses until the first reaction of the time series values. The degree of the polynomials and hardly goes beyond two in practical application.