[FieldTrip] Averaging on a random sample

[Caspar, Emilie]

Dear Fieldtrippers,

I have a sample of 350 trials for one condition, but for statistical analysis reasons I would like to split randomly this sample in two and average these two parts.

so, I used the "randsample" matlab function which seems to work very well and then I averaged this selected sample:

        randomhalf = randsample(cleandata.trial, 175);
        avgFCMiddleRing = ft_timelockanalysis(cfg, randomhalf);


However, I have the following error message :

Error using ft_checkdata (line 366)
This function requires raw or comp data as input.

Error in ft_timelockanalysis (line 105)
data = ft_checkdata(data, 'datatype', {'raw', 'comp'}, 'feedback', 'yes', 'hassampleinfo', 'yes');

Does anyone have a solution to fix the problem?

Thank you very much!

Emilie

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