reformat processed data

[Christopher Miller]

Dear Robert,

I have a question about reformating (pre)processed data:

I performed a frequency analysis with Brain Vision Analyzer and exported the data into Excel. These data are multidimensional (27 channels X 5 frequencybands) and thus consist of 27 X 5 numbers for each of the 16 subjects. Each number represents the power of every channel-frequency combination. Since this was a within design, I have two sets of 27 X 5 for each subject. I want to compare these two sets with a Cluster-level Randomization Test for a Within Subjects experiment, just like the test which is performed in the tutorial on Cluster-level Randomization Tests, page 16-17. In the tutorial this can be done after "load gravgerfcporig;". When this command is executed, two files appear in the workspace: "gravg_erf_cp_FC" and "gravg_erf_cp_FIC", both with the format: "<1x1 struct> struct". However, when I import my data with the import wizard there appears only one file in the workspace, named :"data" with the format: "<160x30 double> double". The numbers 160 and 30 represent the data as needed for analyzing them in SPSS: 160 rows (16 subjects, with 5 frequencybands in 2 conditions). The number 30 represents 30 columns (27 channels and 3 channels to label: (1) the subject(1-16), (2) the frequencybands(1-5) and (3) the condition(1-2).
I know that just saving my imported file as a .mat file doesn't change the structure of the file, since I tried this. My question is, how can I reformat these data in such a way that I can perform a Cluster-level Randomization Test for a Within Subjects experiment?

Thanks in advance,


Christopher Miller, MSc
Unit for Clinical Psychopharmacology and Neuropsychiatry
Department of Psychiatry 974
Radboud University Nijmegen Medical Centre
PO Box 9101
6500 HB  Nijmegen
The Netherlands
Tel.: + 31 24 3613204
Email: CAFJ.Miller at psy.umcn.nl