[FieldTrip] indepsamplesF produces NaN

[Enya Weidner]

Dear Jan-Mathijs,

thank you so much for your help! This indeed fixed it for me. My data produced some NaN when I fed it into the timelockanalysis function, I fixed it and now I’m seeing stats/probabilities when running the F-Test! Thanks a lot!

Have a nice day!
Enya


From: Schoffelen, J.M. (Jan Mathijs)
Sent: 17 March 2021 11:14
To: FieldTrip discussion list
Subject: Re: [FieldTrip] indepsamplesF produces NaN

Dear Enya, 

Assuming that all went well with the definition of the design matrix etc, I suspect that there are NaNs in your data that cause you troubles.

The difference between the ‘ft_statfun_indepsamplesT’, and ‘ft_statfun_indepsamplesF’ is that the former knows how to handle NaNs in the data, whereas the latter doesn’t. My first hunch would therefore be that your data contains NaNs or Infs. Even a single NaN (or inf) would spoil it for the rest of the well-behaved data samples.

Best wishes,
Jan-Mathijs


On 16 Mar 2021, at 15:07, Enya Weidner <enya.weidner at uni-bielefeld.de> wrote:

Hi everyone!
 
I am currently trying to run statistical analyses on timelocked data by comparing the values of three different experimental conditions with help of an F-Test. I tried using the “indepsamplesF” function and it runs smoothly with no errors (there is a warning when I run the montecarlo method saying: “no clusters were found in the observed data”) but produces NaNs in the probabilities and test-statistics. This happens for both the “montecarlo” and the “analytic” method. If I run just simple t-Tests I am getting interpretable results. Does this simply indicate that there are no significant differences between conditions? Wouldn’t there still be an F-value indicating such a result?  
 
Any ideas as to why this happens?
 
Thanks a lot in advance for your help!
 
Enya Weidner
Universität Bielefeld
Fakultät für Psychologie und Sportwissenschaft
AE02 Affektive Neuropsychologie
 
 
----------------------
M.Sc. Enya Weidner
Universität Bielefeld
Fakultät für Psychologie und Sportwissenschaft
AE02 Affektive Neuropsychologie
Raum: T5-220
Telefon: 0521-106 4533
Email: enya.weidner at uni-bielefeld.de
 
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