[R-SIG-Finance] Cost-benefit/value for money analysis
josh.m.ulrich at gmail.com
Tue Jan 4 20:45:34 CET 2011
This really doesn't have anything to do with finance, but I was bored
waiting for something to run. Please direct any questions to me
off-list or to R-help, since this is not on-topic for this list.
On Tue, Jan 4, 2011 at 12:54 PM, Graham Smith <myotistwo at gmail.com> wrote:
> Posted on R-help, but it has been suggested that I also post here.
> I assume this has a "proper" name, but I don't know what it is and wondered
> if anyone knew of a package that might do the following, or something
> As an example, assume I have borrowed and read 10 books on R , and I have
> subjectively given each of them a "value" score in terms of how useful I
> think they are. I also know how much each costs in terms of money.
p <- trunc(runif(10)*100) # prices
v <- trunc(runif(10)*10) # values
> What I would like to do is to calculate the costs of every possible
> combination of the 10 books, and plot the total monetary value for each of
> these possible combination with their associated subjective value totals,
> to help decide which combination of books represents the best value for
bk <- letters[1:10] # books
nb <- 3 # number of books to choose
pc <- combn(p,nb,sum) # price combinations of 3 books
vc <- combn(v,nb,sum) # value combinations of 3 books
bc <- combn(bk,nb) # books in each combination
plot(vc/pc) # value for money
bc[,which.max(vc/pc)] # best combination of value for money
> I know that some specialist decision analysis software does this sort of
> thing, but was hoping R might have an appropriate package.
Everything above was done with the base R packages.
Joshua Ulrich | FOSS Trading: www.fosstrading.com
> Many thanks,
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