Test article S

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Glejser ' s test revisited

Godfrey (1996, Journal of Econometrics 72, 275}299) has shown that the Glejser test for heteroskedasticity is valid only under conditional symmetry. Here, modi"cations of the Glejser test are suggested. The proposed test statistics are asymptotically valid even when the disturbances are not symmetrically distributed and can be used to test for heteroskedasticity when conditional location functi...

A New S-­test for Haplotype Analysis: Concordance and Discordance

A new test of inheritance, S, is proposed, which uses information from affected as well as unaffected siblings in the fam­ ily. The siblings are analyzed in terms of similarities of haplotypes. The distribution of the proposed S­test is derived under the null hypothesis of random inheritance. Mean and variance are obtained for the distribution. The test is then applied to data sets publ...

Invited article: Electric solar wind sail: toward test missions.

The electric solar wind sail (E-sail) is a space propulsion concept that uses the natural solar wind dynamic pressure for producing spacecraft thrust. In its baseline form, the E-sail consists of a number of long, thin, conducting, and centrifugally stretched tethers, which are kept in a high positive potential by an onboard electron gun. The concept gains its efficiency from the fact that the ...

The minimum word length in Li ’ s article

Li [1] does not explicitly assume that the minimum word length that his random text model generates is one. The fact that he shows examples of random texts (p. 1842 of [1]) with sequences of more than one blank in a row at the beginning of his article can be confusing because there is evidence later in the same article that the author is implicitly assuming that words have a minimum length of o...