different MLUs for different CLAN versions

[RCorrigan]

For homework, I had-my Language Acquisition class compute a simple MLU
on Adam's speech in adam01. I noticed that they were getting a
different answer than I did. It turns out that I was using a July
version of CLAN and they were using a September version.
My output looked like this:

>From file <adam01.cha>
mlu +t*CHI adam01.cha
Mon Sep 27 07:14:31 2010
mlu (02-Jul-2010) is conducting analyses on:
  ONLY speaker main tiers matching: *CHI;
****************************************
>From file <adam01.cha>
MLU for Speaker: *CHI
  MLU (xxx and yyy are EXCLUDED from the utterance and morpheme
counts):
	Number of: utterances = 1232, morphemes = 2582
	Ratio of morphemes over utterances = 2.096
	Standard deviation = 1.024

Their output looked like this:
mlu +t*chi adam01.cha
Tue Sep 28 11:33:56 2010
mlu (08-Sep-2010) is conducting analyses on:
  ONLY dependent tiers matching: %MOR;
****************************************
>From file <adam01.cha>
MLU for Speaker: *CHI
  MLU (xxx and yyy are EXCLUDED from the utterance and morpheme
counts):
	Number of: utterances = 1232, morphemes = 2644
	Ratio of morphemes over utterances = 2.146
	Standard deviation = 1.067

I know it's not a big difference, but why should MLUs change from one
slight revision of CLAN to the next? The best I can figure, the July
version must not have been calculating MLU on the %MOR line, but all
the documentation for years has claimed it was.

In addition, the browsable database is using still a different July
version and is giving a slightly different answers than the other two
(both the utterance and morpheme counts are different on this one)

mlu +t*chi adam01.cha

Tue Sep 28 12:36:51 2010 mlu (10-Jun-2009) is conducting analyses on:
ONLY speaker main tiers matching: *CHI;
****************************************
>From file "adam01.cha"
 MLU for Speaker: *CHI
MLU (xxx and yyy are EXCLUDED from the utterance and morpheme counts):
 Number of: utterances = 1236, morphemes = 2582
Ratio of morphemes over utterances = 2.089
Standard deviation = 1.030

Thanks for letting me know what is going on.

Bobbi Corrigan

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