REGRESSION: Implement /ORIGIN subcommand.

[pspp] / doc / regression.texi

diff --git a/doc/regression.texi b/doc/regression.texi
index de639352d001fc6d0194b66e9371333278d3136b..9a159014d005b3d1900645dfff0ef85bd783027f 100644 (file)
--- a/doc/regression.texi
+++ b/doc/regression.texi
@@ -46,6 +46,7 @@ REGRESSION
         /VARIABLES=@var{var_list}
         /DEPENDENT=@var{var_list}
         /STATISTICS=@{ALL, DEFAULTS, R, COEFF, ANOVA, BCOV, CI[@var{conf}]@}
+        @{ /ORIGIN | /NOORIGIN @}
         /SAVE=@{PRED, RESID@}
 @end display
 
@@ -86,6 +87,13 @@ This is what you get if the /STATISTICS command is not specified,
 or if it is specified without any parameters.
 @end table
 
+The @subcmd{ORIGIN} and @subcmd{NOORIGIN} subcommands are mutually
+exclusive.  @subcmd{ORIGIN} indicates that the regression should be
+performed through the origin.  You should use this option if, and
+only if you have reason to believe that the regression does indeed
+pass through the origin --- that is to say, the value @math{b_0} above,
+is zero.  The default is @subcmd{NOORIGIN}.
+
 The @subcmd{SAVE} subcommand causes @pspp{} to save the residuals or predicted
 values from the fitted
 model to the active dataset. @pspp{} will store the residuals in a variable