I've received email, the performance problem with Survival analysis
was fixed in JMP version 4.0.2
a patch exists to move from 4.0.0 to 4.0.2
John Sall benchmarked 6 groups 162,000 rows,
version 4.0.2 ran all by groups in 7 seconds total.
Previously when I ran JMP 3.2, the total time (without time
spent manipulating the mouse) would have been 18 seconds.
I think this is worth mentionning that these benchmarks are
doubly remarkable for both JMP 3.2 and 4.
Firstly is the capability of running very large database,
and secondly the speed is very impressive - since running
a Kaplan-Meier (KM) survival analysis implies sorting all the records
by time. The calculation basis of KM is simple, but implementing
KM efficiently is something I daren't even imagine the difficulties.
To further comments on Ken's question asking comparison of JMP 3
and JMP 4. The two coexist on the same system, JMP 4 installation
didn't interfere with 3.2, files directly readable from one to
the other. Core system looks the same. Handling data,
import-export, much improved. Commands are easier, By_group mode
now immediately available while previously required to run
first Summary_table. I believe the major and the most exciting
difference is script possibility in JMP 4, I would expect
the perspective of libraries of procedures to extend capabilities.
(Comment to Vincent Vinh-Hung who was replying to Ken's
request for comment from users of JMP 4.0 comparing it to JMP 3
and maybe Minitab 13).
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