series

My research involves taking measurements at 9 sections at different locations on the shaft of bones. I am having trouble determining which statistical methods I can use to test for significant difference in the distribution and change of the measurements as they progress along the shaft of the...

hay guys, i'm working on garch models, but a cant turn my returns stationary. how can i do it? i've tried whit log return (logxt - logxt-1) but it doesn't work. r function: log.return<-dff(log(x)) i've implemented some test and these are the results: #######KPSS Test for Trend...

Hello, Thank you very much for taking the time to read this! I have many (~70) time series showing the average body size (kg) for the ~50 years. Each time series is for the same species but from a different region/area. I would like to look at the change in body size over time and how...

Hi, excuse my poor english... I need to reduce number of indicators (and to perform a PCA) on dataset: year ind(1) ind(2) ... ind(n) 2000 x(1,1) x(1,2) ... x(1,n) ..... 2010 x(11,1) x(11,2) ... x(11,n) x(i,j) are quantitative values about indicators like production, resources, ecc. How...

Hi, just wondering can anyone tell em how to sum this term from k=1 to infinity? I used to know how to do it but I forgot, it's something to do with identifying a partial sum, it is the sum of (e^(-0.02k)) Thanks in advance.