Line 196: ID "Estimation" is already defined here:
<span class="mw-headline" id="Estimation">Estimation</span>
These redirects have more than one link. This causes problems with WhatLinksHere since it does not determine redirects, instead listing backlinks which are also redirect pages.
Viewing 19 redirects130 anchor found in Standard deviation of which 108 were not produced by cite.php