PerformanceAnalytics - Style Analysis- plotting R squared over time

Try str() or better yet dput() the data or subset of it to let us actually see the problem as opposed to guessing. 

as.xts would be more illustrative in thi case as well, since that is the end goal. 

Jeff

Jeffrey Ryan    |    Founder    |    jeffrey.ryan at lemnica.com

www.lemnica.com

Philipp, 

Try first:

as.timeSeries(your data)

if it does not work, check the mode of the data 
mode(your data)

That should be numeric. 

Hope that helps.

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