normplot - Normal probability plot
Syntax
h = normplot(X)
Description
h = normplot(X) displays
a normal probability plot of the data in X. For
matrix X, normplot displays a line for each column
of X. h is a handle to the plotted
lines.
The plot has the sample data displayed with the plot symbol '+'.
Superimposed on the plot is a line joining the first and third quartiles
of each column of X (a robust linear fit of the
sample order statistics.) This line is extrapolated out to the ends
of the sample to help evaluate the linearity of the data.
The purpose of a normal probability plot is to graphically assess
whether the data in X could come from a normal
distribution. If the data are normal the plot will be linear. Other
distribution types will introduce curvature in the plot. normplot uses
midpoint probability plotting positions. Use probplot when
the data included censored observations.
Examples
Generate a normal sample and a normal probability plot of the
data.
x = normrnd(10,1,25,1);
normplot(x)
See Also
cdfplot, wblplot, probplot, hist, normfit, norminv, normpdf, normspec, normstat, normcdf, normrnd, normlike
Normal Distribution
 | normpdf | | normrnd |  |
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