Results 181 to 190 of about 5,145,048 (246)

The Index-of-Dispersion Test Revisited

1996
In quantitative ecology the classical index-of-dispersion is widely used for testing the hypothesis of spatial randomness. However, spatial aggregation of individuals is often observed in field experiments, so that the test will frequently reject the hypothesis without indicating any alternatives.
D. Pfeifer, H. Ortleb, U. Schleier-Langer, H.-P. Bäumer   +3 more
openaire   +1 more source

Refractive index dispersion of chalcopyrite crystals

Journal of Physics D: Applied Physics, 1980
The one-gap electronic dispersion model of Wemple and DiDomenico (1969) has been extended, using physically meaningful parameters, to take into account additional dispersion of refractive indices near the lowest energy gap, and applied to the case of chalcopyrite crystals. Dispersion parameters of some chalcopyrite crystals are presented.
openaire   +1 more source

Chromatic Dispersion of Selected Gradient-Index Glasses

Gradient Index Optical Systems, 1994
The degree to which gradient-index (GRIN) elements can be effectively used in optical systems depends partly on the ability to characterize them. This paper discusses measurements of the chromatic dispersion and birefringence made with a multi-wavelength, harmonic phase-shifting interferometer1 on several types of gradient-index glasses.
Christopher E. Saxer, D. T. Moore
openaire   +1 more source

Model Diagnostics for Poisson INARMA Processes Using Bivariate Dispersion Indexes

Journal of Statistical Theory and Practice, 2019
C. Weiß, Boris Aleksandrov
semanticscholar   +1 more source

The Index of Dispersion of Molecular Evolution: Slow Fluctuations

Theoretical Population Biology, 2000
The most simple neutral model of molecular evolution predicts that the number of substitutions within a lineage in T generations ought to be Poisson distributed. Therefore, the variance in the number of substitutions ought to equal the mean number. The ratio of the variance to the mean number of substitutions is called the index of dispersion, R(T ...
openaire   +3 more sources

Characterizing the Variability of Arrival Processes with Indexes of Dispersion

IEEE J. Sel. Areas Commun., 1991
R. Gusella
semanticscholar   +1 more source

Temperature dispersion of refractive indexes in some silicate fiber glasses

IEEE Photonics Technology Letters, 1994
Gorachand Ghosh
semanticscholar   +1 more source

Effects of cardiac rehabilitation and exercise training on indexes of dispersion of ventricular repolarization in patients after acute myocardial infarction.

American Journal of Cardiology, 2003
Thomachan Kalapura, C. Lavie, Waseem Jaffrani, V. Chilakamarri, R. Milani   +4 more
semanticscholar   +1 more source

Note on the Poisson index of dispersion

Trabajos de Estadistica, 1956
Six1,x2,...,xn representan una muestra de N observaciones independientes de una variable de Poisson, se sabe [2] que el «indice de dispersion» $$z = \sum\limits_{i = 1}^N {(x_i - \bar x)^2 } /\bar x$$ tiene aproximadamente una distribucion χ2 con (N−1) grados de libertad.
openaire   +1 more source

Nonparametric Statistical Methods

Technometrics, 1974
Philip H. Ramsey
semanticscholar   +1 more source