[R-SIG-Finance] Rolling Correlation Problem
tonyp
petrovaa at gmail.com
Thu Jun 30 12:11:52 CEST 2011
Hello Masters of R,
I was wondering if somebody can help with a problem I am facing. I have a
zoo object consisting of 500 vectors representing constituents of a
benchmark. I want to calculate the rolling correlation on 22 window period.
The observations are daily return series. However, when I run my code
x22=rollapply(spx,width = 22, FUN = function(x) {y <- cor(x);
round(mean(y[lower.tri(y)]),3); }, by.column = FALSE, align='right')
I get warning message such as the underneath one due to too many 0000s in
some constituents.
Warning messages:
1: In cor(x) : the standard deviation is zero
2: In cor(x) : the standard deviation is zero
3: In cor(x) : the standard deviation is zero
4: In cor(x) : the standard deviation is zero
5: In cor(x) : the standard deviation is zero
6: In cor(x) : the standard deviation is zero
7: In cor(x) : the standard deviation is zero
8: In cor(x) : the standard deviation is zero
Do you know how to calculate the rolling correlations in the presence of too
many zeros?
Thanks.
AP
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