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I'm trying to figure out if some emerging markets change over time.

  • First of all I am going to check for changes in volatility. What would be a good method to do this. And do you suggest comparing the first half of the time series with the second or comparing the first 1/3 with the last 1/3.
  • Secondly, for the correlation. I would like to check if the correlation between one emerging market and the SPX or FTSE100 changes over time, because the correlation should increase as the market 'emerges' and integrates with the emerged markets. Here as well, I wonder whether I should use halves or thirds.

I'm trying to figure out what would be a good method to test this. Do you have any suggestions?

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  • $\begingroup$ Why don’t you use a rolling window for each? $\endgroup$ – SachaTheBrave Oct 5 '20 at 11:40
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"First of all I am going to check for changes in volatility. What would be a good method to do this"

As mentioned in a response to a different question, there are a number of academic papers that use non-parametric tests for determining changes in variance/volatility in financial time series. Whether or not these are "good methods" depends on how you define "good" as they have some obvious drawbacks.

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