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2008 Feb 07
0
Help w/ density() usage
...r All,
(this msg is a statistics/computing question to the list)
I'm trying to implement a modern-version of a (classic) "several-step protocol" in Fishery Biology (due to Bhattacharya, 1967): analysis of length-frequency distribution of fish larvae to id cohorts and later estimate growh rates!
I've trouble with the 1st step: using kernel density estimation (KDE) function to examine size-freq distributions (variable sl):
> density(sl[dofyr==139],bw="nrd0") (dofyr means day of year and refers to a particular sampling date)
> kd139
Call:
density.defaul...