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  • geostatistics  (3)
  • estimation  (1)
  • standardless quantitative XRD  (1)
  • 1
    Electronic Resource
    Electronic Resource
    On the estimation of the generalized covariance function (1982)
    Springer
    Mathematical geology 14 (1982), S. 57-64 
    Details
    ISSN: 1573-8868
    Keywords: estimation ; generalized covariance function ; generalized increments ; geostatistics ; intrinsic random functions ; multicollinearity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract The estimation of the generalized covariance function, K, is a major problem in the use of intrinsic random functions of order k to obtain kriging estimates. The precise estimation by least-squares regression of the parameters in polynomial models for K is made difficult by the nature of the distribution of the dependent variable and the multicollinearity of the independent variables.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01037447
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of drift on the experimental semivariogram (1982)
    Springer
    Mathematical geology 14 (1982), S. 309-319 
    Details
    ISSN: 1573-8868
    Keywords: Bias ; drift ; semivariogram ; geostatistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract When nonlinear drift is present, the nature of the bias in the experimental semivariogram estimator of the semivariogram function is determined by the extent and density of the sampling as well as by the drift function itself. The bias caused by drift may affect the interpretation of the experimental semivariogram over its entire range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01032592
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The combination of sampling and kriging in the regional estimation of coal resources (1982)
    Springer
    Mathematical geology 14 (1982), S. 87-106 
    Details
    ISSN: 1573-8868
    Keywords: coal ; geostatistics ; kriging ; regional estimation ; systematic sampling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Two-dimensional systematic sampling of small plots followed by the kriging of those plots may be employed to obtain regional estimates of coal resources and measures of the accuracy of the estimates. The use of sampling makes large savings in computation possible. Two case studies involving the estimation of coal tonnage are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01083946
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A standardless method of quantitative X-ray diffractometry using target-transformation factor analysis (1984)
    Springer
    Mathematical geology 16 (1984), S. 351-367 
    Details
    ISSN: 1573-8868
    Keywords: clay minerals ; jackknife estimation ; mineral analysis ; standardless quantitative XRD ; target-transformation factor analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract A standardless quantitative X-ray diffraction analysis is developed that simultaneously estimates weight proportions of minerals in a bulk lot of a multiphase material (such as coal ash, cement, or rock)and the weight proportions of chemical oxides or elements in constituent minerals. The method is based on data from bulk chemical analysis (of major oxides or elements)and X-ray diffraction intensity measurements on several subsamples of the bulk lot. Chemical analyses yield a matrix Yof weight proportions of major oxides (or elements)in subsamples. X-ray intensity measurements for minerals in subsamples form a matrix Q.The procedure is basically a factor analysis of Yinvolving a target transformation using Qas a target.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01029886
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    Paper (German National Licenses)
    Fulltext
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