On 07/06/2011 4:14 AM, mpavlic wrote:
Hi all,
this might be a stupid question, but still.
Everytime i find some new function it's prettty easy to understand how to
use the syntax and to perform a text. Even the general idea of what the
function does is pretty easy to understand, but i can not find an
explanation (detailed explanation) of the R output for each function. For
example, a function fitdistr() in MASS package i testing the data against
the distributions (wanted distribution).
fitdistr(k, "lognormal")
meanlog sdlog
3.150725905 0.759584332
(0.012839319) (0.009078769)
But when i get the result I can not find what these numbers mean. Is there a
explanation somewhere in R help for each function?
The Value section of the help page describes what the function returns.
The help page for fitdistr has
Value:
An object of class ‘"fitdistr"’, a list with four components,
estimate: the parameter estimates,
sd: the estimated standard errors,
vcov: the estimated variance-covariance matrix, and
loglik: the log-likelihood.
You should be aware that objects often print only part of their value;
the rest can be extracted using the usual methods, e.g.
fit <- fitdistr(k, "lognormal")
fit$loglik
will print the log likelihood.
This doesn't explain what "meanlog" and "sdlog" are; for that you need
to know about the lognormal distribution, or consult the reference on
the help page.
Duncan Murdoch
Thanks for the help, m
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