[R] Help with function "fitdistr" in "MASS"

[Saji Ren]

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?

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
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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