## Not run:
# data(aapl.data)
# data(goog.data)
# data(spy.data)
# portfolio=portfolio_create(priceDataIx=spy.data)
# portfolio_settings(portfolio,windowLength = '3600s',resultsSamplingInterval='60s')
# positionGOOG=position_add(portfolio,'GOOG',100,priceData=goog.data)
# positionAAPL=position_add(portfolio,'AAPL',300,priceData=aapl.data)
# util_POSIXTimeToDate(compute(kurtosis(portfolio))[[1]][,1])
# ## End(Not run)
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