Greetings,
In this Demo the author uses the relative strength index by using the function rsindex(). Normally this index is used on closingprices of an asset. The author however suggests to detrend the closing prices by substracting a moving average and calculating the relative strengh index on this detrended time series. This should improve the quality of signals generated from this indicator. His exact line of code is:
rsindex(BundClose-movavg(BundClose,30,30),14); where BundClose is a timeseries of closing prices.
However, when I run this line of code on my own price data, I get this error message:
"Expected Closing Price to be nonnegative."
This makes sense, as the price will sometimes be below it's moving average. So I'm wondering why it worked in the demo mentioned and how best to go about calculating such a bounded indicator on detrended price series.
Thanks in advance!
