# [R] simulation in R

David L Carlson dcarlson at tamu.edu
Fri Apr 22 20:50:57 CEST 2016

I don't think we have enough information to help you with this.

Do you intent the simulated values for growthrate to be selected from the values in daT\$growthrate? Or do these values define a distribution of values (perhaps ranging between 0 and 1) and the simulation should use that empirical distribution? In that case any value of growthrate in the range of 0 and 1 inclusive is possible.

What is the sample size of the 9999 Monte Carlo simulations? This will have a major effect on the ranges since as the sample size increases the range will be closer and closer to the range of the growthrate (0 to 1 for condition 3 and 0 to .5 for condition 1).

In your example of no constraints on food (condition 2), if the growthrate is always 1, the range will always be 1 and 1.

-------------------------------------
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77840-4352

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Kristi Glover
Sent: Wednesday, April 20, 2016 1:06 AM
To: R-help
Subject: [R] simulation in R

I realized that there was a typo error. I mean "Monte Carlo Simulation"

________________________________________
From: R-help <r-help-bounces at r-project.org> on behalf of Kristi Glover <kristi.glover at hotmail.com>
Sent: April 19, 2016 11:48 PM
To: R-help
Subject: [R] simulation in R

Hi R user,
Would you mind to help me to find the range with stochastic events? For example,

daT<-structure(list(sn = 1:14, growthrate = c(0.5, 0.6, 0.7, 0.99,
0.1, 0.3, 0.4, 0.5, 0.5, 0.2, 0.1, 0.4, 0.3, 0.43)), .Names = c("sn",
"growthrate"), class = "data.frame", row.names = c(NA, -14L))

I want to find the ranges of growth rate of the above data using Mote corle simulation (9999 times) under three conditions:
1. very drought ( in that condition growth will not be more than 0.5). [what would be the range (max, min ) of the growth rate for this scenario)
2. no constraints of  food (growth will be 1 or 100%) (what would be the range (max,min) of growth rate in this scenario?).
3. Control (as it is) (Range??, max.min)

I tried to find whether some one had same problem but I could not find it, is it too complicated to write the code in R for this example? your help will be highly appreciated.

Sincerely,

KG

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