Statalist The Stata Listserver


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

[no subject]



  n' = exp(persons*b1 + livebait*b2 + b3)

Note: it is possible that visitors who attempt to catch fish may fail,
thus also generating a zero count.

It is the third equation (/lncount) that models the degree of
overdispersion and divides the zero counts between those not attempting
to fish and those attempting to fish but failing to catch fish.
(However, the coefficient does not enter directly into manually
estimating the counts.)

The final step is to modify the count, n', to account for attempts to
catch fish, giving the overall modeled count as:

  n = n' * [1 - P(n=0)]

This count matches that generated by -predict-.

Tom





-----------------------------------------
CONFIDENTIALITY NOTE: This e-mail message, including any attachment(s),
contains information that may be confidential, protected by the
attorney-client or other legal privileges, and/or proprietary non-public
information. If you are not an intended recipient of this message or an
authorized assistant to an intended recipient, please notify the sender
by replying to this message and then delete it from your system. Use,
dissemination, distribution, or reproduction of this message and/or any
of its attachments (if
any) by unintended recipients is not authorized and may be unlawful.


*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index