📄 gslib help backtr.htm
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<H2>GSLIB Help Page: BACKTR</H2></CENTER>
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<STRONG>Description:</STRONG>
<UL>
<LI>Back transform normal scores values according to a table look up
</LI></UL>
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<STRONG>Parameters:</STRONG>
<UL>
<LI><B>datafl:</B> a data file in simplified Geo-EAS format containing the
normal scores.
<LI><B>ivr:</B> the column number for the normal scores.
<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> the output file containing the back transformed values.
<LI><B>transfl:</B> an input file containing the transformation look-up
table, i.e., pairs of <I>z</I> and <I>y</I> values with <I>z</I> being the
original data values or class bound values and <I>y</I> being the
corresponding normal scores values. This is an input file that corresponds
to the table written out by <TT>nscore</TT>, <TT>sgsim</TT>,
<LI><B>zmin</B> and <B>zmax:</B> are the minimum and maximum values to be
used for extrapolation in the tails.
<LI><B>ltail</B> and <B>ltpar</B> specify the back transformation
implementation in the lower tail of the distribution: <B>ltail</B>=1
implements linear interpolation to the lower limit <B>zmin</B> and
<B>ltail</B>=2 implements power model interpolation, with
<I>w=</I><B>ltpar</B> to the lower limit <B>zmin</B>
<LI>Linear interpolation is used between known data values.
<LI><B>utail</B> and <B>utpar</B> specify the back transformation
implementation in the upper tail of the distribution: <B>utail</B>=1
implements linear interpolation to the upper limit <B>zmax</B>
<B>utail</B>=2 power model interpolation, with <I>w</I>=<B>utpar</B> to the
upper limit <B>zmax</B> and <B>utail</B>=4 implements hyperbolic model
extrapolation to the upper limit <B>zmax</B> with <I>w</I> = <B>utpar</B>
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