Freq in a bilingual conversation

[A Cristia]

Dear all,

This is an old thread, but relevant to my own questions, as I'm also trying 
to get some freq counts in bilingual conversations.

The CLAN manual (p. 95) states:

freq +l +s"<- spa>" *.cha 

However, when I run it on my file, I don't get anything (counts of zero). 
Note that 

freq +l *.cha 

does yield the expected results (frequencies by language by speaker). I 
thought there may be something wrong with my file, so I downloaded the CUHK 
corpus, because the "angela.cha" file has some '[- zho]' and tried

freq +l +s"<- zho>" *.cha 

freq +l +s"[- zho]" *.cha 

Still zero counts. I also tried online:
http://childes.psy.cmu.edu/browser/index.php?url=Biling/CUHK/

freq +l +s"[- zho]" angela.cha

Wed Jul 8 21:55:43 2015 freq (21-Apr-2015) is conducting analyses on: ALL 
speaker tiers **************************************** 
*From file "angela.cha"* 
<http://childes.talkbank.org/browser/index.php?url=Biling/CUHK/angela.cha> 
Speaker: *AUN: ------------------------------ 0 Total number of different 
item types used 0 Total number of items (tokens) Speaker: *CHI: 
------------------------------ 0 Total number of different item types used 
0 Total number of items (tokens) Speaker: *UNC: 
------------------------------ 0 Total number of different item types used 
0 Total number of items (tokens) Speaker: *MOT: 
------------------------------ 0 Total number of different item types used 
0 Total number of items (tokens)

 And the same issues with the [ version.

What am I doing wrong?

Thank you in advance,

Alex Cristia
  

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