diff --git a/doc/rrdgraph_rpn.pod b/doc/rrdgraph_rpn.pod
index 74ac4ad40751ad898c783bd0185034c7673a0507..1aaef65302d556e087acf66b36bf1e40adb6f726 100644 (file)
--- a/doc/rrdgraph_rpn.pod
+++ b/doc/rrdgraph_rpn.pod
Example: C<VDEF:perc95=mydata,95,PERCENT>
+=item LSLSLOPE, LSLINT, LSLCORREL
+
+Return the parameters for a B<L>east B<S>quares B<L>ine I<(y = mx +b)>
+which approximate the provided dataset. LSLSLOPE is the slope I<(m)> of
+the line related to the COUNT position of the data. LSLINT is the
+y-intercept I<(b)>, which happens also to be the first data point on the
+graph. LSLCORREL is the Correlation Coefficient (also know as Pearson's
+Product Moment Correlation Coefficient). It will range from 0 to +/-1
+and represents the quality of fit for the approximation.
+
+Example: C<VDEF:slope=mydata,LSLSLOPE>
+
=back
=head1 SEE ALSO