Saji Ren wrote:
Thank you,man. the problem solved.
Plus. when I got the parameters of the data.
And I used the "truehist(mydata)" to get a histogram of the data,
How can I draw a line of the distribution of the estimated parameters in the
histogram plot?
for example:
fitdistr(na.exclude(mydata),"normal")
mean sd
4.052594 75.620350
( 1.420743) ( 1.004617)
truehist(mydata)
After that, I got the histogram of mydata.
And I want plot a extra line of the density of a normal distribution of
mean=4.052594 and sd=75.620350 in the histogram plot?
add this:
curve(dnorm(x, mean=4.052594, sd=75.620350), add=TRUE)
-Peter Ehlers
thank you
Bernardo Rangel tura wrote:
On Sat, 2010-01-02 at 23:20 -0800, Saji Ren wrote:
Hi, R users:
I want to fit my data into a normal distribution by using the command
"fitdistr" in "MASS".
I changed my data class from "ts" to "numeric" by
class(mydata)="numeric"
but after using "fitdistr", I got the result below
fitdistr(mydata,"normal")
mean sd
NA NA
(NA) (NA)
the help doc of "fitdistr" does not mention anything about that, thus I
need
your help.
Thank you in advanced,
Saji from Shanghai
Hi Sajj,
You hava NA in your data
try: fitdistr(na.exclude(mydata),"normal")
--
Bernardo Rangel Tura, M.D,MPH,Ph.D
National Institute of Cardiology
Brazil
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and provide commented, minimal, self-contained, reproducible code.
--
Peter Ehlers
University of Calgary
403.202.3921
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
