filter outliers in e-prime

[ashraf]

how could i filter outliers in reaction time with e-merge,and is this
cutoffs applay to accuracy

[Michiel Spape]

Hi Ashraf,
Here's how:
Go to e-merge, merge all your subjects into one file, right click on the file and select open to open it in e-DataAid. Go to analyze, filter, and just check all the RTs you believe are above or below your cut-off. (for Simon tests, I usually do between 200 and 1000 ms, for example) - select lowest RT above criterion, hold shift, select highest RT below criterion) and filter. There's a lot of literature on how best to filter (what ranges, and such, IQR, +- 2SD), but typically, the results remain pretty much the same if your experiment is okay anyway and there's even a good deal of support for just using a criterion (such as my example).
For more difficult techniques, use a different analysis programme (as suggested, SPSS).
Best,

Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology

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[ashraf]

thank you very much for your reply,

On Dec 11, 2:55 pm, Michiel Spape <Michiel.Sp...@nottingham.ac.uk>
wrote:

> Hi Ashraf,
> Here's how:
> Go to e-merge, merge all your subjects into one file, right click on the file and select open to open it in e-DataAid. Go to analyze, filter, and just check all the RTs you believe are above or below your cut-off. (for Simon tests, I usually do between 200 and 1000 ms, for example) - select lowest RT above criterion, hold shift, select highest RT below criterion) and filter. There's a lot of literature on how best to filter (what ranges, and such, IQR, +- 2SD), but typically, the results remain pretty much the same if your experiment is okay anyway and there's even a good deal of support for just using a criterion (such as my example).
> For more difficult techniques, use a different analysis programme (as suggested, SPSS).
> Best,
>
> Michiel Spapé
> Research Fellow
> Perception & Action group
> University of Nottingham
> School of Psychology
>
>
>
> -----Original Message-----
> From: e-p...@googlegroups.com [mailto:e-p...@googlegroups.com] On Behalf Of ashraf
> Sent: 11 December 2009 00:14
> To: E-Prime
> Subject: filter outliers in e-prime
>
> how could i filter outliers in reaction time with e-merge,and is this
> cutoffs applay to accuracy
>
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>
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