Plotting skewed normal distribution with a bar plot

Hi Michael,

Thanks for pointing me fGarch.? I actually started there, but it is not yet
available for 2.13.2 so I went directly to the (sn-package).

I've briefly explored your suggestion and think it will work.

Thanks
Steve

On Nov 3, 2011 10:41 PM, "R. Michael Weylandt" <michael.weylandt at gmail.com>
wrote:

It seems like you'll need to apply some sort of MLE to estimate the
parameters directly from the data before using dsn() to get the
density. This might help with some of it:
http://help.rmetrics.org/fGarch/html/snorm.html

Michael

On Thu, Nov 3, 2011 at 2:54 PM, ?<Steve_Friedman at nps.gov> wrote:

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