dependence is positive. Ecological reliable corrections in most cases. examine different methodologies
phenomena often are patchy and Interval-censored survival for handling grouped survival
give data with a wave structure, data, in which the event of inter- data, presenting models not often
producing autocorrelation that est is not observed exactly, but used, such as the Aalen additive
cycles between positive and nega- is only known to occur within hazards model. They compare
tive with increasing distance, fur- some time interval, occur fre- imputation and interval-censored
ther complicating the situation. quently. In many studies, all approaches and apply their meth-
Their article describes the essen- units are surveyed at a common ods to a complex study of lifetime
tials of dealing with this problem set of times, and all that is known of mango trees infected with a
as commonly encountered in ana- is that the failure occurred in the fungus. This experiment was
lyzing ecological data for two vari- last interval. Suely Ruiz Giolo, conducted in a completely ran-
ables and develop several corrective Enrico Antonio Colosimo, and domized block design with five
methods. These methods prove to Clarice Garcia Borges Demétrio, blocks and six scions grafted on
be robust for a wide range of spa- in “Different Approaches for seven rootstocks and visited 12
tial autocorrelation structures in Modeling Grouped Survival times at irregular intervals over
one-dimensional data and provide Data: A Mango Tree Study,” the last 35 years. ■
See you in 2010 at the
Joint Statistical Meetings
in Vancouver, British Columbia
July 31–August 5, 2010
Vancouver Convention Center
For information, email
jsm@amstat.org
or call toll-free (888) 231-3473.
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26 AMSTAT NEWS JULY 2009
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