[R] simulation study using R [SEC=UNCLASSIFIED]

[Augusto.Sanabria at ga.gov.au]

Davood,

I developed an MC simulation model for wind
hazard analysis last year. I found three important
issues to increase efficiency:
1) Reuse most variables in each loop
2) Write results (1000 stats) to external files, perhaps
one file for each condition.
(a good ID for each file can be implemented using "paste")
3) Develop a function to process the results stored in 
the external files. This is done once the simulation has finished.

Hope it helps,

Augusto


--------------------------------------------
Augusto Sanabria. MSc, PhD.
Mathematical Modeller
Risk & Impact Analysis Group
Geospatial & Earth Monitoring Division
Geoscience Australia (www.ga.gov.au)
Cnr. Jerrabomberra Av. & Hindmarsh Dr.
Symonston ACT 2601
Ph. (02) 6249-9155






-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Davood Tofighi
Sent: Tuesday, 4 March 2008 11:06
To: r-help at r-project.org
Subject: [R] simulation study using R


Dear All,

I am running a Monte Carlo simulation study and have some questions on how to
manage data storage efficiently at the end of each 1000 replication loop. I
have three conditions coded using the FOR {} loops and a FOR loop that
generates data for each condition, performs analysis, and computes a
statistic 1000 times. Therefore, for each condition, I will have 1000
statistic values. My question is what's the best way to store the 1000
statistic for each condition. Any suggestion on how to manage such simulation
studies is greatly appreciated. Thanks,

-- 
Davood Tofighi
Department of Psychology
Arizona State University

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