TY - GEN
T1 - New blockwise permutation tests preserving exchangeability in functional neuroimaging
AU - Zhou, Chunxiao
AU - Wang, Yongmei Michelle
PY - 2009
Y1 - 2009
N2 - In this paper, we present a new blockwise permutation test approach based on the moments of the test statistic. The method is of importance to functional neuroimaging studies. In order to preserve the exchangeability condition required in permutation, we divide the time series into certain exchangeability blocks. In addition, efficient moments-based permutation tests are performed by approximating the permutation distribution of the test statistic with the Pearson distribution series. This involves the calculation of the first four moments of the permutation distribution within each block and then over the whole time series. The accuracy and efficiency of the proposed method are demonstrated using both simulated time series and fMRI data.
AB - In this paper, we present a new blockwise permutation test approach based on the moments of the test statistic. The method is of importance to functional neuroimaging studies. In order to preserve the exchangeability condition required in permutation, we divide the time series into certain exchangeability blocks. In addition, efficient moments-based permutation tests are performed by approximating the permutation distribution of the test statistic with the Pearson distribution series. This involves the calculation of the first four moments of the permutation distribution within each block and then over the whole time series. The accuracy and efficiency of the proposed method are demonstrated using both simulated time series and fMRI data.
UR - http://www.scopus.com/inward/record.url?scp=77950995040&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77950995040&partnerID=8YFLogxK
U2 - 10.1109/IEMBS.2009.5333853
DO - 10.1109/IEMBS.2009.5333853
M3 - Conference contribution
C2 - 19964721
AN - SCOPUS:77950995040
SN - 9781424432967
T3 - Proceedings of the 31st Annual International Conference of the IEEE Engineering in Medicine and Biology Society: Engineering the Future of Biomedicine, EMBC 2009
SP - 6977
EP - 6980
BT - Proceedings of the 31st Annual International Conference of the IEEE Engineering in Medicine and Biology Society
PB - IEEE Computer Society
T2 - 31st Annual International Conference of the IEEE Engineering in Medicine and Biology Society: Engineering the Future of Biomedicine, EMBC 2009
Y2 - 2 September 2009 through 6 September 2009
ER -