[R] Testing a timeseries for heteroscedastic (lmtest)

Simon Ohrem s.o at online.de
Wed Jan 14 20:40:18 CET 2004


my intention is to test a given timeseries (vector) for heteroscedastic.
Now I found the gqtest/bptest/hmctest in the lmtest package but a
"formula" as argument is needed.
What is meant by formula and how du I interpret the timeseries as

Thanks in advance


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