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Regarding the anchor-text api, there is no definition for *imr on the wiki:
http://apiwiki.seomoz.org/w/page/13991127/Anchor Text API

ie.

http://lsapi.seomoz.com/linkscape/anchor-text/google.com?Scope=phrase_to_page&Cols=2048&Sort=domains_linking_page&Expires=1329770786.46868

returns "[{"apuimr":5.422834471373288e-12},{"apuimr":4.785130890652429e-13},{"apuimr":2.922901387480201e-09}]"

What is *imr?