There is an issue of Statistical Methods in Medical Research in November
2002 devoted to analysis of data with excess zeros. An article by Moulton
et al considers the problem of observations that are below the limit of
detection which the data in question seem to be. There are several other
interesting articles in this issue.
Peter A. Lachenbruch
Director, Division of Biostatistics, OBE/CBER
Tel: (301) 827-3320
FAX: (301) 827-5218
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