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Analytic expressions for distance-redshift relations that have been corrected for the effects of some inhomogeneities in the Friedmann-Robertson-Walker (FRW) mass density are used to illustrate the significance of inhomogeneities in a determination of q0 made by using Type Ia supernovae. The value of q0 inferred from a given set of observations depends on the fractional amount of matter in inhomogeneities and is up to 50% larger than that obtained by using the standard Mattig m-z result for pure-dust FRW models.
Kantowski et al. (Sat,) studied this question.
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