Displaying 4 results from an estimated 4 matches for "v_ij".
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2012 May 29
0
mlogit package inquiry
...lity U(i,j)
??Assuming each outcome was chosen by maximizing?the utility.
? Let U*(i) = max{ U(i,j) | 1 <= j <= m_i }
? Therefore, each outcome was chosen among m_i items by finding the
index j such that U(i,j) = U*(i).
? For the utility function U(i,j), there are some independent
variables, V_ij(k), 1 <= k <= N
? i.e. ?U(i,j) = theta_1 * V_ij(1) + theta_2 * V_ij(2) + ... + theta_N V_ij(N)
? Further assume the?probability?of choosing H(i,j) in observations i is:
? P(i,j) = exp(U(i,j)) / sum_{j=1}^{m_i} ( exp(U(i,j))
? Then, I will estimate the parameters of the model theta_1, theta_...
2006 Jul 16
2
CFD Plots in R and Other Things
...hogonal to the z axis.
For each section, I have a set of velocity readings, i.e. the data I
would like to plot are in the form:
v_11 v_12 v_13 ..... v_1n
v_21 v_22 v_23 ..... v_2n
......................................
v_m1 v_m2 v_m3 ..... v_mn
where v_ij is the velocity reading on the i-th position along z and
the j-th position along r.
Tipically, these sets of data are plotted in 2D with r and z as axis
and the velocity field represented by using colours explained by a
legenda.
Can R do anything like this?
Second (and much simpler question): I ha...
2018 Feb 02
1
R-gui sessions end when executing C-code
...while(iter < maxIter && not_converged)
{
/* make v_ij + (1-mu)*ln(q_ij) */
for (j=0; j<H_c; j++)
{...
2011 Aug 08
1
mixed model fitting between R and SAS
Hi al,
I have a dataset (see attached), which basically involves 4 treatments for a chemotherapy drug. Samples were taken from 2 biopsy locations, and biopsy were taken at 2 time points. So each subject has 4 data points (from 2 biopsy locations and 2 time points). The objective is to study treatment difference.?
I used lme to fit a mixed model that uses "biopsy.site nested within pid"