Compute the valuation of a portfolio at one or more times. These can then be plotted.
This presumes that you have or can create a portfolio object. For example, that you have mastered “Passive, no benchmark (minimum variance)”.
- portfolio object
- Portfolio Probe
You need a portfolio object with which to create valuations.
You also need to have the Portfolio Probe package loaded into your R session:
If you don’t have Portfolio Probe, see “Demo or Buy”.
Doing the example
opMinVarobject from the “Passive, no benchmark (minimum variance)” example
You need to have the package loaded into your R session:
We do these tasks:
- the valuation at one point in time
- the valuation path through time
Valuation at one point in time
We create the valuation by using prices at the time point of interest:
valOpMinVarEnd07 <- valuation(opMinVar, xassetPrices[502,], collapse=TRUE)
This uses the prices at the close of the last trading day of 2007, so one year after the portfolio was formed.
The valuation is:
> format(valOpMinVarEnd07, nsmall=2, big.mark=",") prices "3,090,027.16"
Valuation path through time
Instead of focusing on one specific time, we look at the evolution of value over time.
To do this we need to use a matrix of prices for the times (and assets) of interest:
valOpMinVarDaily07 <- valuation(opMinVar, xassetPrices[251:502,], collapse=TRUE)
The result is a vector with a value for each time in the price matrix that we gave to
We can just plot the path without trauma:
The result of that command is Figure 1.
Figure 1: Default plotting of valuation path.
A more pleasing plot can be produced using something like:
plot(valOpMinVarDaily07/1e6, xlab="Trading day in 2007", ylab="Valuation (millions of dollars)", , type="l", col="steelblue", lwd=3)
The command above produces Figure 2.
Figure 2: More pleasing plot of the valuation path.
valuation function can do quite a lot. We’ve seen that it can take prices at either one time or multiple times and return something sensible.
collapse argument controls the granularity of the result. When it is
FALSE, then you get information on the individual assets. When it is
TRUE, you get information on the portfolio as a whole. (It is possible to have something in between as well.)
We have given the
valuation function an object that was the result of a call to
trade.optimizer. But we didn’t need to. We would get the same thing if we gave it a vector that described the portfolio — that is, a vector of the number of units of each asset where the names are the asset identifiers.
In particular, these commands give us the same answer:
valOpt <- valuation(opMinVar, xassetPrices[500:503,], collapse=TRUE) valVec <- valuation(opMinVar$new.portfolio, xassetPrices[500:503,], collapse=TRUE)
We compare the two return vectors by binding them into a matrix, and show the vector that we give to
valuation in the second instance:
> rbind(valOpt, valVec) 2007-12-27 2007-12-28 2007-12-31 valOpt 3105810 3111558 3090027 valVec 3105810 3111558 3090027 2008-01-02 valOpt 3059643 valVec 3059643 > opMinVar$new.portfolio XA105 XA280 XA298 XA643 XA675 XA709 XA731 XA778 2659 17920 2906 20192 7182 6485 4166 6840 XA891 XA966 5200 6247
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