Message-ID: <OFA37959C1.95986C8D-ON8525793D.005BA469-8525793D.0067D752@nps.gov>
Date: 2011-11-03T18:54:13Z
From: Steve_Friedman at nps.gov
Subject: Plotting skewed normal distribution with a bar plot
Hi,
I need to create a plot (type = "h") and then overlay a skewed-normal
curve on this distribution, but I'm not finding a procedure to accomplish
this. I want to use the plot function here in order to control the bin
distributions.
I have explored the sn library and found the dsn function. dsn uses known
location, scaling and shape parameters associated with a given input vector
of probabilities. However, how can I calculate the skewed-normal curve if
I don't know these parameters in advance?
Is there another function to calculate the skew-normal, perhaps in a
different package?
I'm working with R 2.13.2 on a windows based machine.
Steve Friedman Ph. D.
Ecologist / Spatial Statistical Analyst
Everglades and Dry Tortugas National Park
950 N Krome Ave (3rd Floor)
Homestead, Florida 33034
Steve_Friedman at nps.gov
Office (305) 224 - 4282
Fax (305) 224 - 4147