On Mon, 15 Mar 2010, ????? ???????? wrote:


  Dear all,


  I need to fit a set of empirical data to cumulative normal distribution to
  find the mean and sd of theoretical distribution. But I assume that my data
  set  describes only part of PDF, for example, only half of theoretical
  distribution. What function allows it in R? Thank you.

See

        Introduction to R
        Sections 8.1 and 11.7.2

and review the Posting Guide to reframe your question if you need more help.

Chuck

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Charles C. Berry                            (858) 534-2098
                                            Dept of Family/Preventive Medicine
E mailto:cbe...@tajo.ucsd.edu               UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901

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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.

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