[Corpora-List] Considering Distributions Across Texts

Adam Kilgarriff adam at lexmasterclass.com
Mon Mar 3 12:40:22 CET 2014


Dear Brian,

Are the 300-400 texts from 300-400 different people? If yes, then, if you use document frequencies ("how many documents does this word/construction/... occur in") rather than "how many times does it occur" you will cancel out skews based on particular people.

If the texts are all the result of the same essay question, or a limited number of essay questions, then of course you have the bias related to what the students were being asked to write about.

I'm a sceptic about statistical significance testing (for the full argument see here<http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.100.6901&rep=rep1&type=pdf>)

- the main thing is to have a good understanding of the structure of your sample, and the ways that is likely to introduce bias

Adam

On 3 March 2014 11:02, Don Tuggener <tuggener at cl.uzh.ch> wrote:


> Hi Brian,
>
> I'm guessing you're looking for tests that help you identify statistical
> significance of your query results?
> A good starting point may be:
> 2010f. Gries, Stefan Th. Useful statistics for corpus linguistics. In
> Aquilino Sánchez & Moisés Almela (eds.), A mosaic of corpus linguistics:
> selected approaches, 269-291. Frankfurt am Main: Peter Lang.
> (
> http://www.linguistics.ucsb.edu/faculty/stgries/research/overview-research.html
> )
>
> Best,
> Don
>
> On Mon, 03 Mar 2014 11:28:35 +0100
> corpora-request at uib.no wrote:
>
> > Message: 3
> > Date: Fri, 28 Feb 2014 11:16:11 -0500
> > From: Brian Schanding <bschanding at gmail.com>
> > Subject: [Corpora-List] Considering Distributions Across Texts
> > To: corpora at uib.no
> >
> > Hello,
> >
> > I'm working on research with learner corpora. My corpora aren't that big
> > (approx. 250,000 wds with about 300-400 text files). I wonder what
> > research/textbook sources anyone can point me to that discuss the
> > importance of considering how many texts in the corpus a language feature
> > occurs in (as opposed to merely considering overall frequency of a
> language
> > feature within a corpus).
> >
> > Many Thanks!
> > Brian
>
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-- ======================================== Adam Kilgarriff <http://www.kilgarriff.co.uk/> adam at lexmasterclass.com Director Lexical Computing Ltd<http://www.sketchengine.co.uk/>

Visiting Research Fellow University of Leeds<http://leeds.ac.uk>

*Corpora for all* with the Sketch Engine <http://www.sketchengine.co.uk>

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