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Minimum variance portfolio weights

A portfolio invested in two stocks is not realistic. A more realistic example is to consider an equity portfolio invested in two diversified exchange traded funds (ETFs), like an ETF invested in US stocks and an ETF invested in EU stocks. In this exercise you need to use the GARCH estimation output available as usgarchfit and eugarchfit to compute the weights of the US ETF in the minimum variance portfolio invested in the US and EU ETF using the formula Min variance weights

Este exercício faz parte do curso

GARCH Models in R

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Instruções do exercício

  • Compute the standardized US and EU returns, together with their correlation.
  • Compute the covariance and variance of the US and EU returns.
  • Compute the minimum variance weights and plot them.

Exercício interativo prático

Experimente este exercício completando este código de exemplo.

# Compute the standardized US and EU returns, together with their correlation 
stdusret <- residuals(usgarchfit, standardize = TRUE)
stdeuret <- ___

useucor <- as.numeric(___(___, ___))
print(useucor)

  # Compute the covariance and variance of the US and EU returns 
useucov <- ___ * sigma(___) * ___
usvar <- ___
euvar <- ___

# Compute the minimum variance weight of the US ETF in the US-EU ETF portfolio 
usweight <- (euvar - ___) / (usvar + ___ - 2 * ___)
plot(usweight)
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