Request for help &#8211; I need a statistician
<p>GPSD has a serious bug somewhere in its error modeling. What it effects is position-error estimates GPSD computes for GPSes that don&#8217;t compute them internally themselves and report them on the wire.  The code produces plausible-looking error estimates, but they lack a symmetry property that they should have to be correct.</p>
<p>I need a couple of hours of help from an applied statistician who can read C and has experience using covariance-matrix methods for error estimation. Direct interest in GPS and geodesy would be a plus.</p>
<p>I don&#8217;t think this is a large problem, but it&#8217;s just a little beyond my competence.  I probably know enough statistics and matrix algebra to understand the fix, but I don&#8217;t know enough to find it myself.</p>
<p>Hundreds of millions of Google Maps users might have reason to grateful to anyone who helps out here. </p>
<p>UPDATE: Problem solved, see next post.</p>
