📄 gslib help qpplt.htm
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<H2>GSLIB Help Page: QPPLT</H2></CENTER>
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<STRONG>Description:</STRONG>
<UL>
<LI><TT>qpplt</TT> takes univariate data from two data files and generates
either a Q-Q or a P-P plot. Q-Q plots compare the quantiles of two data
distributions, and P-P plots compare the cumulative probabilities of two
data distributions. These graphical displays are used to compare two
different data distributions, e.g., compare an original data distribution to
a distribution of simulated points. </LI></UL>
<DT><IMG height=14 alt=o src="GSLIB Help QPPLT.files/ball.red.gif" width=14>
<STRONG>Parameters:</STRONG>
<UL>
<LI><B>datafl1:</B> The data file for the first variable (<I>x</I> axis) in
a simplified Geo-EAS format.
<LI><B>ivr1</B> and <B>iwt1:</B> column number for the variable and the
weight. If <B>iwt1</B> less than or equal to 0, equal weighting is
considered.
<LI><B>datafl2:</B> The data file for the second variable (<I>y</I> axis) in
a simplified Geo-EAS format. Note: It is possible that <B>datafl2</B> is the
same as <B>datafl1</B>
<LI><B>ivr2</B> and <B>iwt2:</B> column number for the variable and the
weight. If <B>iwt2</B> less than or equal to 0, equal weighting is
considered.
<LI><B>tmin</B> and <B>tmax:</B> all values strictly less than <B>tmin</B>
and strictly greater than <B>tmax</B> are ignored.
<LI><B>outfl:</B> file for PostScript output.
<LI><B>qqorpp:</B> The flag to tell the program whether to construct a Q-Q
plot (<B>qqorpp</B>=0) or a P-P plot (<B>qqorpp=1</B>).
<LI><B>npoints:</B> number of points to use on the Q-Q or P-P plot (should
not exceed the smallest number of data in <B>datafl1</B> / <B>datafl2</B>
<LI><B>xmin</B> and <B>xmax:</B> minimum and maximum limits for <I>x</I>
axis.
<LI><B>ymin</B> and <B>ymax:</B> minimum and maximum limits for <I>y</I>
axis.
<LI><B>ilog:</B> =0 then an arithmetic scaling of the axes is used, =1 then
a logarithmic scaling (base 10) is used. Note that the log scaling only
applies to the Q-Q plot; the axis for the P-P plot are between 0 and 1
<LI><B>title:</B> a 40-character title for the top of the plot. A short
description of the program </LI></UL></DT></DL><IMG height=8 alt=---
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