What have you tried so far - can you explain? "fitdistrplus" package is the default package for fitting distributions.

Regards,
Indrajit



________________________________
 From: rch4 <rch4@geneseo.edu>
To: r-help@r-project.org 
Sent: Tuesday, November 29, 2011 8:39 AM
Subject: [R] Negative exponential fit
 
We need help....

We are doing a project for a statistical class in and we are looking at
world record times in different running events over time. We are trying to
fit the data with a negative exponential but we just cant seem to get a
function that works properly. 
we have on our x-axis the date and on the y-axis the time(in seconds). So as
you can imagine, the times have decreased and appear to be approaching a
limit. Any ideas for a nls function that would work for us would be greatly
appreciated. 

Rob

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