MATLAB POLYSPACE RELEASE NOTES User Manual download pdf (Page 179)

Preprocessing Data

The smoothed d ata are shifted from the previous plot. convn with the 'same'

parameter returns the central part of the convolution, the same length as the

data.

filter returns the initial part of the convolution, the same length as

the data. Otherwise, the a lg orithms are identical.

Smoothing estimates the center of the distribution of response values at each

value of the predictor. It invalida tes a basic assumption of many fitting

algorithms, namely, that the errors at each value of the predictor a re normally

distributed. Accordingly, smoothed data should not be used to fit a model. Use

smoothed data to identify a model.

See “Filtering Data” in the M ATLAB Data Analysis documentation for more

information on smoothing and filtering.

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MATLAB POLYSPACE RELEASE NOTES User Manual Page 179