Bert : Thank you for your advice, it would be a little bit difficult to
do it for my master thesis but, if I want to go further with a PhD
thesis (and I do want), I would probably follow your advice and get in
touch with a statistician.
Yishin : Thank you very much for the references, I will definitively
read the papers you quote. I'm already a little bit aware of the misuses
possible with the vincentization in particular thanks to the paper of
Rouder and Speckman (2004) and it seems to fit with my design. No
problem if you want to keep the code but I have to tell you that it's
our first semester using R and the teacher surely didn't thought that we
will run out of available code with our experiment. Like John guessed
the purpose of the course was to give a first view of R to get over the
temptation of SPSS, my bad if I want to avoid biased statistics like
sample mean ANOVA's on RT.
Dan : Thank you for your tip, this sure will help but I'm quiet at the
beginning of my R skills so I hardly trust myself to do it on my own,
but I can sure give it a try.
John : I had the same assumption but my research director warned me that
I might run out of time for my first presentation by doing so but fairly
enough for my master thesis. But again like I said to Dan I'm quiet
concerned by my actual R skill.
Anyway I have to say that I'm really glad to see how much help you can
get by using the r-help mailing-list.
Regards,
Gabriel
Le 21/05/2015 15:52, John Kane a écrit :
In line
John Kane
Kingston ON Canada
-----Original Message-----
From: yishinlin...@gmail.com
Sent: Thu, 21 May 2015 10:13:54 +0800
To: gabriel.wein...@gmail.com
Subject: Re: [R] Vincentizing Reaction Time data in R
On Wed, 20 May 2015 18:13:17 +0800,
Hi Gabriel,
As far as I could recall, there isn't an R package that has explicitly
implemented "vincentization". You definitively can find some code
segments/functions that have implemented "vincentize" on the web. But you
should verify if they do exactly what you wish to do. If you could look
at the question from percentile/quantle perspective, it would not take
you too much time to realise that they are similar. I would suggest you
to read, as John Kane suggested, Prof. Ratcliff's 1979 paper. Another
paper that may be very helpful is Prof van Zandt's 2000 RT paper.
However, you should be aware that there are some different implementation
of "vincentization", and it is debatable, if not problematic, to use it,
rather than other more general quantile methods. It would help you to
understand not only how to do vincentization, but also why/why not if you
could read papers from Jeff Rouder's as well as from Heathcote's and
Brown's lab.
Sorry that I hesitate to give you the code, because this looks like part
of your course works. It would be more rewarding for you, if you could
figure out by yourself.
Yishin
While I agree the exercise is likely to be a good learning experience I don't
see this as the equivalent of course work.
If Gabriel (the OP) was tasked with implementing "vincentization" in R then,
strictly speaking it is course work but if I understand him the requirement is to do his
work in R rather than Minitab. If such a function existed in an existing R package than
he could have simply plugged in the numbers et voilà, done.
The tenor of the question did not suggest this and it would require the stats instructor
to know that there was no "vincentization" function anywhere among the, what,
a thousand or so packages? And if the OP was working on his own data as part of the
course then the instructor might have little or no idea of exactly what functions are
needed
The course strikes me more as an effort to get psychologists away from SPSS
which often seems to be the only software package anyone knows.
Gabriel WEINDEL wrote:
Dear all,
For my master thesis, I'm currently working in cognitive neuroscience
on executive control through measurement of reaction time and I need
to get my data 'vincentized' with an exclusive use of R set by my
statistic teacher for a test purpose, for this reason I can't use the
python code the lab team usually uses.
Despite a dozen hours of research I couldn't find any package or
R-code which would allow the use of vincentization, that's why I'm
querying help on the R forum.
So has anyone ever used vincentization in R ?
Best regards,
--
Gabriel Weindel
Master student in Neuropsychology - Aix-Marseille University (France)
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