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August 17, 2011

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Dear Dr Martyn Plummer and Dr B. D. Ripley,

I have been using your command "spectrum", which is extremely useful.

Recently, our group started to use Mathematica's Wavelet analysis tool. We have to compare
the results between "spectrum" and Wavelet.
However, the units used by these two methods are
different.

Please let me know the unit of "spectral density"
generated from your spectrum command.

Additionally, I would like to know the .R code
to obtain the confidence interval for the each
"spec" generated from spectrum command.

Sincerely
Yoshiro Nagao MD MSc PhD
[email protected]

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