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  • 1
    Electronic Resource
    Electronic Resource
    An alternative method for significance testing of waveform difference potentials (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Psychophysiology 30 (1993), S. 0 
    Details
    ISSN: 1469-8986
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: Guthrie and Buchwald (1991) proposed an ad hoc procedure for assessing the statistical significance of waveform difference potentials that may arise in a variety of psychophysiology research contexts. In our paper, an alternative method is presented and demonstrated that has fewer underlying assumptions than does the Guthrie-Buchwald test and may, therefore, produce better results in some situations. In particular, the test proposed here (a) is distribution free, (b) requires no assumption of an underlying correlation structure (e.g., first-order autoregressive), (c) requires no estimate of the population autocorrelation coefficient, (d) is exact, (e) produces p values for any number of subjects and time points, and (f) is highly intuitive as well as theoretically justifiable. This procedure may be used to carry out multiple comparisons with exact specification or experimentwise error, however, this test is based on permutation principles and may require large amounts of computer time for its implementation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1469-8986.1993.tb02075.x
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    Paper (German National Licenses)
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  • 2
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    Meta-Analysis and the Solomon Four-Group Design (1994)
    Washington D.C., Wash. : Periodicals Archive Online (PAO)
    The Journal of Experimental Education. 62:4 (1994:Summer) 361 
    Details
    ISSN: 0022-0973
    Topics: Education
    Notes: MEASUREMENT, STATISTICS, AND RESEARCH DESIGN
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:h101-1994-062-04-000006
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 3
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    Commentary: I've Been Testing Some Statistical Hypotheses--Can You Guess What They Are? (1978)
    Bloomington, Ill. : Periodicals Archive Online (PAO)
    Journal of Educational Research. 72:2 (1978:Nov./Dec.) 116 
    Details
    ISSN: 0022-0671
    Topics: Education
    Notes: DEPARTMENTS
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:1123-1978-072-02-000011
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    An exact statistical method for comparing topographic maps, with any number of subjects and electrodes (1994)
    Springer
    Brain topography 6 (1994), S. 203-210 
    Details
    ISSN: 1573-6792
    Keywords: Brain Topography ; Statistics ; Evoked Potentials ; Electroencephalography (EEG) ; Positron Emission Tomography (PET) ; Magnetic Resonance Imaging (MRI)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Statistical methods for testing differences between neural images (e.g., PET, MRI or EEG maps) are problematic because they require (1) an untenable assumption of data sphericity and (2) a high subject to electrode ratio. We propose and demonstrate an exact and distribution-free method of significance testing which avoids the sphericity assumption and may be computed for any combination of electrode and subject numbers. While this procedure is rigorously rooted in permutation test theory, it is intuitively comprehensible. The sensitivity of the permutation test to graded changes in dipole location for systematically varying levels of signal/noise ratio, intersubject variability and number of subjects was demonstrated through a simulation of 70 different conditions, generating 5,000 different data sets for each condition. Data sets were simulated from a homogenous single-shell dipole model. For noise levels commonly encountered in evoked potential studies and for situations where the number of subjects was less than the number of electrodes, the permutation test was very sensitive to a change in dipole location of less than 0.75 cm. This method is especially sensitive to localized changes that would be “washed-out‘ by more traditional methods of analysis. It is superior to all previous methods of statistical analysis for comparing topographical maps, because the test is exact, there is no assumption of a multivariate normal distribution or of the correlation structure of the data requiring correction, the test can be tailored to the specific experimental hypotheses rather than allowing the statistical tests to limit the experimental design, and there is no limitation on the number of electrodes that can be simultaneously analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01187710
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    Paper (German National Licenses)
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