Accession Number : AD0702856

Title :   DATA REDUCTION WITH GROUPING AND WEIBULL MODELS.

Descriptive Note : Interim scientific rept.,

Corporate Author : MICHIGAN STATE UNIV EAST LANSING DIV OF ENGINEERING RESEARCH

Personal Author(s) : Dubes,Richard C.

Report Date : 30 JAN 1970

Pagination or Media Count : 75

Abstract : The computational details are given for a two-step procedure for condensing size-graded data, especially bio-medical data, into a parametric statistical model. The first step establishes a histogram of size density while the second fits a Weibull model to the histogram. Three types of histograms are defined and compared on the basis of computational efficiency. An algorithm is proposed for simultaneously estimating the scale, shape, and location parameters of a Weibull distribution from a histogram, and figures of merit for the Weibull fit are defined. The Weibull model is shown to be more flexible than an Edgeworth model. Examples are provided based on computer-simulated data and electroencephalographic (EEG) data. One example classifies EEG sleep data according to sleep stage with the shape parameter of a Weibull fit to a frequency histogram. (Author)

Descriptors :   (*ELECTROENCEPHALOGRAPHY, PATTERN RECOGNITION), (*STATISTICAL DATA, CURVE FITTING), STATISTICAL DISTRIBUTIONS, SEQUENTIAL ANALYSIS, DISTRIBUTION FUNCTIONS, SUBROUTINES, ALGORITHMS, SIMULATION

Subject Categories : Medicine and Medical Research
      Statistics and Probability
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE