Displaying 4 results from an estimated 4 matches for "delta_".
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2011 Jan 03
1
Greetings. I have a question with mixed beta regression model in nlme.
...Gamma_{1i} = c_1 + v_{1i}
*
*The vector* *(u_{0i}, u_{1i})'* *has normal distribution with mean*
*(0, 0)'* *and covariance matrix*
*sigma_{00} sigma_{01}
sigma_{10} sigma_{11}
*
*The vector* *(v_{0i}, v_{1i})'* *has normal distribution with mean*
*(0, 0)'* *and covariance matrix*
*delta_{00} delta_{01}
delta_{10} delta_{11}
*
*The* *w_{ij}s are independents. Each* *w_{ij}* *has mean* *0* *and variance
* *W*.
*The unknown parameters are:*
*
b_0, b_1, b_2, c_0, c_1, c_2, sigma_{00}, sigma_{10},
sigma_{11}, delta_{00}, delta_{10}, **and* *delta_{11}*.
*The question is:
How can I use...
2011 Jan 03
0
Greetings. I have a question with mixed beta regression model in nlme (corrected version).
...Gamma_{1i} = c_1 + v_{1i}
*
*The vector* *(u_{0i}, u_{1i})'* *has normal distribution with mean*
*(0, 0)'* *and covariance matrix*
*sigma_{00} sigma_{01}
sigma_{10} sigma_{11}
*
*The vector* *(v_{0i}, v_{1i})'* *has normal distribution with mean*
*(0, 0)'* *and covariance matrix*
*delta_{00} delta_{01}
delta_{10} delta_{11}
*
*The* *w_{ij}s are independents. Each* *w_{ij}* *has mean* *0* *and variance
* *W*.
*The unknown parameters are:*
*
b_0, b_1, b_2, c_0, c_1, c_2, sigma_{00}, sigma_{10},
sigma_{11}, delta_{00}, delta_{10}, **delta_{11}** **and* *W*.
*The question is:
How can...
2010 Oct 04
0
spatial interaction (gravity) model as Poisson regression
...ve searched the
archives extensively, and there are several mentions of this question,
but I have yet to find anything concrete that I can wrap my head
around... apologies if I have missed something.
Basically, the conventional origin constrained model would look
something like this:
T_{ij} = exp(\delta_{i} + \log{A_{j}} - \beta D_{ij}) ~ \varepsilon_{ij}
where \delta_{i} is a constant parameter speci?c to the ith zone,
A_{j} is the attractiveness of the jth location, and D_{ij} is the
distance between i and j. Note that \varepsilon_{ij} is just the
multiplicative error term of the ?ow from i to j,...
2008 Jan 31
3
Log rank test power calculations
Does anyone have any ideas how I could do a power calculation for a log
rank test. I would like to know what the suggested sample sizes would
be to pick a difference when the control to active are in a ratio of 80%
to 20%.
Thanks
Dan
--
**************************************************************
Daniel Brewer, Ph.D.
Institute of Cancer Research
Email: daniel.brewer at icr.ac.uk