search for: electrophysiolog

...2007-04-23) I understand this: > .Machine$integer.max [1] 2147483647 > .Machine$sizeof.longlong [1] 8 So how can I get a "longlong" (i.e., 64-bit = 8-byte integers) in my environment? Where is there no storage.mode of "longlong" or "int64"? I'm reading electrophysiology data with a time stamp that's in a 64-bit integer (it's a microsecond clock count) but I'm getting negative values returned in R: # Why no warning if this call doesn't return an 8-byte integer? TimeStamp <- readBin(connection, integer(), size=8, 1) [1] -311761023 [1] -3117...

Hi, I am performing experiments in the field of visual perception where we often apply balanced designs. Within a group of normal subjects, we vary different stimulus conditions (like contrast, luminance, temporal frequency of stimulation) and derive some psychophysical or electrophysiological results from our subjects. Often, the main question is to test the effect of these parameters on the recorded results. When switching from Statview (old software on Mac computers, no longer supported) to R I learned that the problem is translated to a repeated measures ANOVA via ano...

I have a question regarding significance testing for the difference in the ratio of means. The data consists of a control and a test group, each with and without treatment. I am interested in testing if the treatment has a significantly different effect (say, in terms of fold-activation) on the test group compared to the control. The form of the data with arbitrary n and not assuming equal