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Bug 1779 - ERF tutorial fails to find significant effect said to be in data

Reported 2012-10-12 16:26:00 +0200
Modified 2012-10-12 17:50:39 +0200
Product: FieldTrip
Component: documentation
Version: unspecified
Hardware: PC
Operating System: Windows
Importance: P3 normal
Assigned to:
Depends on:
See also:

Roemer van der Meij - 2012-10-12 16:26:28 +0200

In: Parametric and non-parametric statistics on event-related fields Last section of tutorial: The call to ft_clusterplot (the last function call in the tutorial), says it cannot find any cluster plot-able at the current alpha of 0.05. A few lines above, it is stated in the text: "Now a channel-time cluster is found from 0.33 s untill 0.52 s in which p < 0.05."

Lilla Magyari - 2012-10-12 17:46:30 +0200

hi Roemer, this issue came up this week when the test_tutorial_eventrelatedstatistics failed exactly because of the same reason. If I remember well, Jorn fixed it. The problem was that the p value is close to 0.05, so it sometimes significant, sometimes not. Depends on the randomization. So, if you run the tutorial script again (or a few times), it will be significant again ;). If it won't, then there is another problem. Lilla

Roemer van der Meij - 2012-10-12 17:50:32 +0200

Ah, of course. I think we also discussed it some time ago or so. Right'o, bug invalid :).