Type-Token Ratios

[beachjade]

Dear All,

I am analyzing a 20-minute language sample (10-min free play, 10-min shared
book reading) and want to calculate a type-token ration to characterize
lexical diversity.  I understand that TTRs can be greatly influenced by the
size of the language sample.  Can any of you recommend a current best
practice for calculating an unbiased TTR?

Thanks in advance,
Margaret Friend
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