Early phonological development

[Barbara Zurer Pearson]

Dear Nina,
I second the choice of 10 children.  The number you need, I believe, depends 
on the variability in your measures, (which I suspect is pretty great in 
early phonological measures), but I have found as a rule of thumb that 10 is 
better than 7 and not usually much better than 12.  When I have done 
preliminary analyses of groups before all the data were collected, group 
means from 6 and 7 children were rarely within a standard error plus or 
minus of the eventual group (of around 30), whereas groups of 10 almost 
always were.  You might start out with a couple extra though to guard 
against technical failures and non-cooperation--or hurricanes, in our case!

Good luck,
Barbara
*************************************************************
Barbara Zurer Pearson, Ph.D.
Research Associate,
Depts of Linguistics and Communication Disorders
226 South College
University of Massachusetts
Amherst MA 01003

Tel: 413-545-5023
Fax: 413-545-2792

bpearson at research.umass.edu
www.umass.edu/aae/bp_indexold.htm
www.zurer.com/pearson


----- Original Message ----- 
From: "Nina" <n.g.garmann at iln.uio.no>
To: "Info-CHILDES" <info-childes at googlegroups.com>
Sent: Thursday, May 22, 2008 5:50 AM
Subject: Early phonological development


>
> Dear all,
>
> I am currently planning a three year post doctor project on the early
> phonological development of Norwegian children. I find it difficult to
> determine the appropriate number of children for this study. My
> current plan is to compile data from one-hour play sessions with 10
> children every six weeks for six months (18, 19.5, 21, 22.5, 24
> months). Has anyone done a similar study or could anyone in other ways
> supply me with any ideas concerning the number of participants,
> session intervals or the six months period of data compilation?
>
> Regards, Nina G. Garmann
> >
> 


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