MATLAB CURVE FITTING TOOLBOX - RELEASE NOTES Podręcznik Użytkownika Pobierz pdf (Strona 66)

2 Importing, Viewing, and Preprocessing Data

2-32

Example: Excluding and Sectioning Data

This example modifies the ENSO data set to illustrate excluding and

sectioning data. First, copy the ENSO response data to a new variable and add

two outliers that are far removed from the bulk of the data.

rand('state',0)

yy = pressure;

yy(ceil(length(month)*rand(1))) = mean(pressure)*2.5;

yy(ceil(length(month)*rand(1))) = mean(pressure)*3.0;

Import the variables month and yy as the new data set enso1, and open the

Exclude GUI.

Assume that the first and last eight months of the data set are unreliable, and

should be excluded from subsequent fits. The simplest way to exclude these

data points is to section the predictor data. To do this, specify the range of data

you want to include in the

Exclude X outside of field of the Section pane.

There are two ways to exclude individual data points: using the

Check to

exclude point

table or graphically. For this example, the simplest way to

exclude the outliers is graphically. To do this, select the data set name and click

the

Exclude graphically button, which opens the Select Points for Exclusion

Rule GUI.

Data points outside the

specified domain are

marked for exclusion.

Select the data set.

Open the GUI to exclude

data points graphically.

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Models	Document Type
400104	Installation Guide LiquiFix 400104 Installation Guide, 1 pages
400185	Instruction Manual LiquiFix 400185 Instructions / Assembly, 1 pages

MATLAB CURVE FITTING TOOLBOX - RELEASE NOTES Podręcznik Użytkownika Strona 66