search for: karnisky

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2006 Mar 18
1
Time-Series, multiple measurements, ANOVA model over time points, analysis advice
...error rate. If we run analysis at many small sections of a long time-series, the Type-I family-wise error rate is a concern. Is it important to consider the temporal dependence in the time-series data? There are papers on ramdomization tests for the sort of time-series data we have (eg, Blair and Karnisky, 1993), but these papers often report only t-test comparisons, not F-tests with 2+ factors. BACKGROUND: We have a dataset from a human neuroimaging experiment. Subjects view a screen, with a fixation point at the center. A cue arrow appears, directing their attention to the lower left or right...
2010 Apr 24
2
multiple paired t-tests without loops
I am new to R and I suspect my problem is easily solved, but I haven't been able to figure it out without using loops. I am trying to implement Blair & Karniski's (1993) permutation test. I've included a sample data frame below. This data frame represents the conditional means (C1, C2) for 3 subjects in 2 consecutive samples of a continuous data set (e.g. ERP waveform).