Abstract: An efficient Sommerfeld's integral approximation is used for calculating electric field in frequency domain based on modelling of a lightning channel by a vertical monopole antenna. Results ...

An important part of the marginal maximum likelihood method described previously is the computation of the integral over the random effects. The default method in PROC NLMIXED for computing this ...

THE probability integral can be represented by the simple approximation over such a range (t<3) as to make the approximation useful to the statistician and others whose problems do not require great ...

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