Bootstrapping in R Not Displaying Relevant Statistic

Question

I have bootstrapped a project for a class I'm in and when attempting to display the specific statistic I want, I am met with errors. I am coding this with R programming language for statistics in R studio. Here is my code:

  boot = do(20)* 
  {
  horizon = 20
  totalwealth = 10000
  pweights = c(0.5, 0, 0, 0, 0.5)
  holdings = pweights * totalwealth
  wealthtracker = rep(0, horizon) # Set up a placeholder to track total wealth
  for(today in 1:horizon) {
    return.today = resample(myreturns, 1, orig.ids=FALSE)
    holdings = holdings*(1+return.today)
    totalwealth = sum(holdings)
    wealthtracker[today] = totalwealth
  }
  VaR = unname(quantile(wealthtracker, p=0.05)) 
  VaR
  }

  hist(boot$VaR)

The error I am encountering occurs when I try and take data or build a histogram from my sample statistic, in this case, VaR.

Whenever I type in 'boot$' the next thing to appear should be 'VaR' and the other statistics in my bootstrapped model, but the only thing that shows up is 'result'. When I enter commands to return anything with VaR in the context of the bootstrap (bootstrap$VaR) I return this error - 'x' must be numeric. The problem here is that I've already made sure 'x' is numeric by applying the unname function. Any help here is greatly appreciated.

Thanks.

What packages are you using? How are variables like `myreturns` defined? It's easiest to help if you provide a [reproducible example](http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example) with sample input data. — MrFlick, May 03 '17 at 23:47

score 1 · Answer 1 · answered May 03 '17 at 23:49

When you use the mosaic package's do() function, the results are always in a column called result. It doesn't matter what you called the variable within those brackets.

Instead of trying to access boot$VaR, just work with boot$result, such as

hist(boot$result)

It contains the data you want.

Bootstrapping in R Not Displaying Relevant Statistic

1 Answers1