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...t ac measures the amount of clustering structure found. From the definition given in help(agnes.object), however, it seems that as long as the dissimilarity of the merger in the final step of the algorithm is large enough, the ac value will be close to 1. So what does ac really mean? Thank you, Weiguang

...Stationarity data: r KPSS Level = 3.1955, Truncation lag parameter = 7, p-value = 0.01 Warning message: p-value smaller than printed p-value in: kpss.test(r) So this says we can have more confidence in saying r is _not_ stationary? Should I worry about the warnings? Thanks very much. Weiguang

Hi, Is there a Zipf-like distribution RNG in R? Thanks, Weiguang

...kpss.test() on it to verify its stationarity. The tests gave me the p-value above 0.1. Since the null hypothesis N0 is that the series _is_ stationary, this means that I cannot reject N0. But the series does look periodic! So does all this say stationarity and periodicity can co-exist? Thanks, Weiguang

...eekends). Before I do the ARMA fit (which takes care of seasonality with a lag equal to one day), do I have to make sure the data is stationary? From the results and visually, it seems that this was taken care of. But the residual failed the kpss test with a p-value less than 0.01. Thank you, Weiguang