differences in MLU between browser and CLAN

[Leonid Spektor]

Hi Jenny,

	Browser CLAN is over 5 years old. It is not longer compatible with the data format. Until people in charge of the web things here at CMU update it to the latest version, please tell your students to rely on downloaded transcripts using CLAN only for accurate result. 


Leonid.

> On Nov 18, 2025, at 16:50, Jennifer Ganger <jennifer.ganger at gmail.com> wrote:
> 
> Hello again,
> Some of my students pointed out today that they are getting different MLU results when they run it within the browser versus in CLAN. The effect seems to be widespread--not just one corpus. They noticed discrepancies with the Tardif corpus at first but then found more.
> 
> Taking Eve (Brown corpus) file 020000a in the browser as an example, the command
> mlu +t*CHI  020000a.cha yields:
> From file <childes/Eng-NA/Brown/Eve/020000a.cha> MLU for Speaker: *CHI: MLU (xxx, yyy and www are EXCLUDED from the utterance and morpheme counts): 
> Number of: utterances = 424, morphemes = 3687 
> Ratio of morphemes over utterances = 8.696 
> Standard deviation = 5.953
> 
> That can't be correct. 
> 
> In downloaded transcripts using CLAN, the same command yields:
> From file <C:\talkbank\clan\Brown\Eve\020000a.cha>
> MLU for Speaker: *CHI:
>   MLU (xxx, yyy and www are EXCLUDED from the utterance and morpheme counts):
> 	Number of: utterances = 424, morphemes = 1468
> 	Ratio of morphemes over utterances = 3.462
> 	Standard deviation = 1.975
> 
> Any advice would be appreciated.
> 
> Thanks,
> Jenny
> 
> 
> 
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