Wakefield’s Hierarchical Ecological Inference Model
The EI models accept several different formula syntaxes.  If 
 and  are the column totals, and 
 and  are the row totals, and  is the total in unit 
, then the formula can be expressed with just one row and one column, with the totals provided separately as:
z.out <- zelig(C1 ~ R1, N=N, data=data)
The argument N can be either a numeric vector of the total in each i-th unit, or the character name of a variable in the dataset that contains these values.
Or with both rows and columns coupled together, and omitting the totals:
z.out <- zelig( cbind(C1,C2) ~ cbind(R1,R2), data=data)
Additionally, if C1, C2, R1, R2 are percentages rather than counts, then either formula method above is acceptable, however, N must always be provided.
First load packages:
library("Zelig")
library("ZeligEI")
Here is an example of all the syntax for the analysis using the first syntax method, and the direct use of the reference classes:
z5 <- zeihier$new()
z5$zelig(C1 ~ R1, N=myN, weights = w, data = myData)
z5$setx()
z5$sim()
With the Zelig 4 compatibility wrappers this looks like:
z.out <- zelig(C1 ~ R1, N=N, model = "eihier", weights = w, data = myData)
x.out <- setx(z.out)
s.out <- sim(z.out, x = x.out)
In addition, Zelig accepts the following additional inputs for eihier to monitor the convergence of the Markov chain:
The model also accepts the following additional arguments to specify prior parameters used in the model:
Users may wish to refer to help(MCMCdynamicEI) for more options.
We’ll use a dataset from the ei package, of black and non-black turnout in 141 precincts.
library("ei", quietly=TRUE)
##
## Attaching package: 'coda'
## The following object is masked from 'package:arm':
##
##     traceplot
data(sample)
Here is the model estimated in Zelig.
z.out <- zeihier$new()
z.out$zelig(t~x, N="n", data=sample)
summary(z.out)
## Model:
##
## Iterations = 5001:55000
## Thinning interval = 1
## Number of chains = 1
## Sample size per chain = 50000
##
## 1. Empirical mean and standard deviation for each variable,
##    plus standard error of the mean:
##
##                Mean       SD Naive SE Time-series SE
## p0table1   0.071436 0.078023 3.49e-04       6.48e-03
## p0table2   0.080973 0.114551 5.12e-04       1.30e-02
## p0table3   0.072274 0.082796 3.70e-04       6.58e-03
## p0table4   0.077294 0.103491 4.63e-04       8.86e-03
## p0table5   0.077767 0.104512 4.67e-04       9.09e-03
## p0table6   0.074752 0.093577 4.18e-04       7.38e-03
## p0table7   0.078859 0.108135 4.84e-04       1.17e-02
## p0table8   0.079053 0.109479 4.90e-04       9.87e-03
## p0table9   0.071804 0.079629 3.56e-04       6.82e-03
## p0table10  0.071656 0.079061 3.54e-04       6.30e-03
## p0table11  0.071977 0.081226 3.63e-04       5.80e-03
## p0table12  0.069398 0.069386 3.10e-04       5.63e-03
## p0table13  0.073864 0.088924 3.98e-04       7.63e-03
## p0table14  0.075628 0.096575 4.32e-04       7.85e-03
## p0table15  0.069987 0.071474 3.20e-04       5.84e-03
## p0table16  0.074841 0.093829 4.20e-04       6.94e-03
## p0table17  0.081995 0.117027 5.23e-04       1.28e-02
## p0table18  0.080602 0.114533 5.12e-04       1.17e-02
## p0table19  0.080430 0.111818 5.00e-04       1.15e-02
## p0table20  0.079105 0.107834 4.82e-04       9.98e-03
## p0table21  0.078316 0.106679 4.77e-04       1.02e-02
## p0table22  0.069781 0.069642 3.11e-04       5.93e-03
## p0table23  0.077192 0.101955 4.56e-04       9.52e-03
## p0table24  0.070463 0.072994 3.26e-04       6.04e-03
## p0table25  0.081716 0.116677 5.22e-04       1.25e-02
## p0table26  0.076926 0.100804 4.51e-04       8.86e-03
## p0table27  0.073473 0.087508 3.91e-04       7.48e-03
## p0table28  0.075491 0.096164 4.30e-04       7.90e-03
## p0table29  0.080572 0.113409 5.07e-04       1.28e-02
## p0table30  0.071206 0.076504 3.42e-04       5.93e-03
## p0table31  0.074835 0.092900 4.15e-04       7.49e-03
## p0table32  0.078493 0.107157 4.79e-04       1.14e-02
## p0table33  0.080990 0.114045 5.10e-04       1.19e-02
## p0table34  0.069615 0.069599 3.11e-04       5.82e-03
## p0table35  0.075882 0.097188 4.35e-04       8.55e-03
## p0table36  0.077248 0.103221 4.62e-04       9.18e-03
## p0table37  0.070617 0.074170 3.32e-04       5.81e-03
## p0table38  0.082013 0.118051 5.28e-04       1.19e-02
## p0table39  0.081788 0.115987 5.19e-04       1.33e-02
## p0table40  0.078940 0.108788 4.87e-04       1.11e-02
## p0table41  0.074680 0.093349 4.17e-04       8.07e-03
## p0table42  0.075691 0.096700 4.32e-04       8.36e-03
## p0table43  0.072316 0.082915 3.71e-04       7.18e-03
## p0table44  0.080306 0.112131 5.01e-04       1.16e-02
## p0table45  0.078590 0.106996 4.78e-04       1.08e-02
## p0table46  0.077231 0.102901 4.60e-04       8.49e-03
## p0table47  0.081068 0.114822 5.14e-04       1.12e-02
## p0table48  0.074158 0.089863 4.02e-04       7.28e-03
## p0table49  0.080546 0.112917 5.05e-04       1.17e-02
## p0table50  0.078429 0.107117 4.79e-04       9.64e-03
## p0table51  0.073102 0.086626 3.87e-04       5.95e-03
## p0table52  0.079114 0.109408 4.89e-04       1.01e-02
## p0table53  0.079457 0.110799 4.96e-04       1.04e-02
## p0table54  0.076338 0.099930 4.47e-04       8.62e-03
## p0table55  0.070931 0.075591 3.38e-04       6.17e-03
## p0table56  0.075460 0.096036 4.29e-04       8.03e-03
## p0table57  0.070824 0.075291 3.37e-04       5.92e-03
## p0table58  0.080882 0.114202 5.11e-04       1.23e-02
## p0table59  0.078994 0.109557 4.90e-04       1.08e-02
## p0table60  0.070305 0.072105 3.22e-04       5.81e-03
## p0table61  0.081349 0.113797 5.09e-04       1.19e-02
## p0table62  0.080429 0.112856 5.05e-04       1.14e-02
## p0table63  0.081051 0.114635 5.13e-04       1.22e-02
## p0table64  0.073916 0.089371 4.00e-04       7.04e-03
## p0table65  0.078977 0.108073 4.83e-04       1.13e-02
## p0table66  0.078398 0.106532 4.76e-04       1.07e-02
## p0table67  0.075188 0.095212 4.26e-04       7.72e-03
## p0table68  0.078378 0.106186 4.75e-04       9.46e-03
## p0table69  0.082377 0.116754 5.22e-04       1.26e-02
## p0table70  0.079149 0.107455 4.81e-04       9.74e-03
## p0table71  0.082340 0.118188 5.29e-04       1.18e-02
## p0table72  0.081234 0.114100 5.10e-04       1.27e-02
## p0table73  0.071516 0.078784 3.52e-04       6.94e-03
## p0table74  0.073846 0.089262 3.99e-04       7.35e-03
## p0table75  0.071013 0.075761 3.39e-04       5.63e-03
## p1table1   0.000454 0.000107 4.80e-07       4.85e-06
## p1table2   0.000466 0.000111 4.98e-07       4.92e-06
## p1table3   0.000454 0.000107 4.77e-07       5.09e-06
## p1table4   0.000458 0.000107 4.79e-07       5.19e-06
## p1table5   0.000458 0.000108 4.83e-07       5.08e-06
## p1table6   0.000454 0.000109 4.87e-07       5.07e-06
## p1table7   0.000461 0.000108 4.84e-07       4.95e-06
## p1table8   0.000461 0.000109 4.87e-07       5.00e-06
## p1table9   0.000454 0.000107 4.80e-07       4.96e-06
## p1table10  0.000455 0.000108 4.82e-07       5.10e-06
## p1table11  0.000453 0.000107 4.80e-07       5.21e-06
## p1table12  0.000454 0.000108 4.83e-07       5.06e-06
## p1table13  0.000455 0.000108 4.83e-07       5.16e-06
## p1table14  0.000457 0.000109 4.86e-07       5.20e-06
## p1table15  0.000454 0.000107 4.80e-07       5.11e-06
## p1table16  0.000456 0.000108 4.84e-07       5.06e-06
## p1table17  0.000472 0.000113 5.06e-07       4.99e-06
## p1table18  0.000466 0.000112 5.01e-07       5.13e-06
## p1table19  0.000472 0.000115 5.13e-07       5.08e-06
## p1table20  0.000474 0.000114 5.08e-07       4.92e-06
## p1table21  0.000459 0.000108 4.84e-07       4.79e-06
## p1table22  0.000454 0.000106 4.75e-07       5.10e-06
## p1table23  0.000458 0.000108 4.82e-07       5.12e-06
## p1table24  0.000454 0.000107 4.80e-07       5.00e-06
## p1table25  0.000467 0.000112 5.02e-07       4.95e-06
## p1table26  0.000457 0.000107 4.81e-07       5.03e-06
## p1table27  0.000454 0.000107 4.80e-07       5.20e-06
## p1table28  0.000458 0.000109 4.88e-07       4.90e-06
## p1table29  0.000465 0.000112 5.02e-07       5.12e-06
## p1table30  0.000454 0.000106 4.75e-07       5.28e-06
## p1table31  0.000456 0.000108 4.82e-07       4.94e-06
## p1table32  0.000461 0.000110 4.93e-07       5.12e-06
## p1table33  0.000468 0.000113 5.05e-07       5.13e-06
## p1table34  0.000454 0.000109 4.86e-07       5.20e-06
## p1table35  0.000457 0.000108 4.83e-07       5.03e-06
## p1table36  0.000457 0.000108 4.84e-07       5.20e-06
## p1table37  0.000453 0.000108 4.82e-07       5.13e-06
## p1table38  0.000467 0.000111 4.97e-07       5.16e-06
## p1table39  0.000472 0.000113 5.05e-07       4.89e-06
## p1table40  0.000460 0.000108 4.83e-07       5.00e-06
## p1table41  0.000455 0.000107 4.78e-07       4.98e-06
## p1table42  0.000457 0.000108 4.84e-07       4.90e-06
## p1table43  0.000454 0.000107 4.80e-07       5.09e-06
## p1table44  0.000468 0.000113 5.05e-07       5.07e-06
## p1table45  0.000459 0.000109 4.86e-07       4.95e-06
## p1table46  0.000457 0.000108 4.83e-07       5.01e-06
## p1table47  0.000465 0.000110 4.92e-07       5.07e-06
## p1table48  0.000456 0.000107 4.77e-07       4.98e-06
## p1table49  0.000466 0.000111 4.96e-07       5.23e-06
## p1table50  0.000460 0.000108 4.85e-07       5.05e-06
## p1table51  0.000456 0.000109 4.86e-07       4.96e-06
## p1table52  0.000461 0.000109 4.88e-07       5.05e-06
## p1table53  0.000462 0.000110 4.90e-07       4.98e-06
## p1table54  0.000457 0.000109 4.88e-07       5.05e-06
## p1table55  0.000455 0.000107 4.80e-07       5.10e-06
## p1table56  0.000456 0.000107 4.79e-07       5.01e-06
## p1table57  0.000455 0.000108 4.84e-07       5.07e-06
## p1table58  0.000466 0.000111 4.98e-07       4.89e-06
## p1table59  0.000461 0.000109 4.89e-07       5.08e-06
## p1table60  0.000453 0.000107 4.77e-07       5.09e-06
## p1table61  0.000470 0.000110 4.93e-07       5.11e-06
## p1table62  0.000465 0.000110 4.94e-07       5.08e-06
## p1table63  0.000470 0.000111 4.98e-07       5.15e-06
## p1table64  0.000454 0.000107 4.79e-07       5.08e-06
## p1table65  0.000463 0.000109 4.88e-07       5.11e-06
## p1table66  0.000460 0.000108 4.83e-07       5.05e-06
## p1table67  0.000455 0.000107 4.77e-07       4.88e-06
## p1table68  0.000461 0.000108 4.83e-07       4.83e-06
## p1table69  0.000476 0.000117 5.24e-07       5.05e-06
## p1table70  0.000469 0.000110 4.94e-07       4.94e-06
## p1table71  0.000469 0.000112 5.01e-07       5.17e-06
## p1table72  0.000476 0.000113 5.03e-07       5.04e-06
## p1table73  0.000454 0.000108 4.81e-07       5.13e-06
## p1table74  0.000454 0.000107 4.81e-07       5.10e-06
## p1table75  0.000455 0.000108 4.81e-07       5.19e-06
## mu0       -2.868125 0.865837 3.87e-03       1.23e-01
## mu1       -7.710528 0.173314 7.75e-04       1.24e-02
## sigma^2.0  1.009668 8.796670 3.93e-02       5.43e-01
## sigma^2.1  0.028775 0.046034 2.06e-04       2.14e-03
##
## 2. Quantiles for each variable:
##
##                2.5%       25%       50%       75%     97.5%
## p0table1   0.007334  0.030204  0.051509  0.092133  0.226094
## p0table2   0.008097  0.030895  0.052737  0.095122  0.292241
## p0table3   0.007502  0.030150  0.051557  0.092805  0.231089
## p0table4   0.007910  0.030606  0.052071  0.093718  0.257752
## p0table5   0.007971  0.030606  0.052359  0.093965  0.261572
## p0table6   0.007620  0.030356  0.052062  0.093065  0.244019
## p0table7   0.007926  0.030713  0.052259  0.094266  0.273386
## p0table8   0.007970  0.030779  0.052440  0.094121  0.274642
## p0table9   0.007257  0.030334  0.051716  0.092626  0.227308
## p0table10  0.007537  0.030153  0.051768  0.092104  0.227463
## p0table11  0.007451  0.030096  0.051425  0.092026  0.230965
## p0table12  0.007169  0.029939  0.051315  0.091538  0.213278
## p0table13  0.007492  0.030427  0.051813  0.092691  0.239910
## p0table14  0.007636  0.030581  0.052016  0.093600  0.249649
## p0table15  0.007242  0.030020  0.051404  0.091806  0.217634
## p0table16  0.007657  0.030416  0.052003  0.092824  0.242830
## p0table17  0.008097  0.031081  0.053024  0.095444  0.309722
## p0table18  0.008051  0.030936  0.052688  0.094609  0.291766
## p0table19  0.008280  0.030961  0.052648  0.094895  0.293962
## p0table20  0.008094  0.030817  0.052635  0.094713  0.278270
## p0table21  0.008075  0.030885  0.052445  0.094243  0.267480
## p0table22  0.007296  0.030015  0.051508  0.091662  0.221939
## p0table23  0.007757  0.030734  0.052328  0.093928  0.261274
## p0table24  0.007258  0.029935  0.051521  0.092066  0.223657
## p0table25  0.008079  0.031107  0.052865  0.095553  0.303024
## p0table26  0.007873  0.030584  0.052147  0.094222  0.258724
## p0table27  0.007526  0.030259  0.051750  0.092659  0.239638
## p0table28  0.007758  0.030462  0.051984  0.093278  0.248120
## p0table29  0.008054  0.030978  0.052878  0.094555  0.289962
## p0table30  0.007254  0.030119  0.051597  0.092101  0.227370
## p0table31  0.007792  0.030304  0.051872  0.093012  0.244027
## p0table32  0.007980  0.030600  0.052328  0.094229  0.273628
## p0table33  0.008084  0.030985  0.052602  0.094811  0.300736
## p0table34  0.007172  0.029832  0.051317  0.091376  0.219639
## p0table35  0.007623  0.030497  0.052068  0.093480  0.253780
## p0table36  0.007839  0.030697  0.052147  0.093850  0.260327
## p0table37  0.007151  0.030019  0.051417  0.091948  0.224274
## p0table38  0.008273  0.031035  0.053008  0.095182  0.301218
## p0table39  0.008353  0.031098  0.053122  0.095737  0.303734
## p0table40  0.008026  0.030650  0.052495  0.094156  0.275872
## p0table41  0.007649  0.030240  0.051942  0.092952  0.242450
## p0table42  0.007680  0.030544  0.052058  0.093197  0.250878
## p0table43  0.007504  0.030245  0.051515  0.092581  0.230677
## p0table44  0.008228  0.031005  0.052816  0.095071  0.282990
## p0table45  0.007910  0.030595  0.052350  0.094379  0.276969
## p0table46  0.007894  0.030523  0.052147  0.094028  0.259708
## p0table47  0.008157  0.030940  0.052572  0.094787  0.302381
## p0table48  0.007643  0.030487  0.052053  0.093009  0.242739
## p0table49  0.008230  0.030957  0.052475  0.094702  0.292066
## p0table50  0.007826  0.030739  0.052351  0.093948  0.266893
## p0table51  0.007624  0.030256  0.051812  0.092627  0.233090
## p0table52  0.007982  0.030649  0.052569  0.094436  0.278852
## p0table53  0.008066  0.030950  0.052506  0.094342  0.277700
## p0table54  0.007876  0.030518  0.052162  0.093283  0.255370
## p0table55  0.007326  0.030157  0.051634  0.092050  0.227015
## p0table56  0.007762  0.030464  0.052131  0.093612  0.245558
## p0table57  0.007298  0.030116  0.051566  0.091641  0.224876
## p0table58  0.008182  0.030978  0.052802  0.095118  0.297408
## p0table59  0.008040  0.030558  0.052243  0.094072  0.273982
## p0table60  0.007315  0.030141  0.051519  0.092104  0.218726
## p0table61  0.008190  0.030829  0.052945  0.095143  0.304161
## p0table62  0.008176  0.030970  0.052811  0.095065  0.285795
## p0table63  0.008156  0.031006  0.052724  0.095181  0.294578
## p0table64  0.007454  0.030378  0.051875  0.092615  0.241226
## p0table65  0.008054  0.030624  0.052690  0.094049  0.277606
## p0table66  0.007879  0.030644  0.052349  0.094237  0.267574
## p0table67  0.007707  0.030365  0.051864  0.093303  0.244718
## p0table68  0.008098  0.030672  0.052327  0.094133  0.271527
## p0table69  0.008364  0.031162  0.053023  0.096031  0.317175
## p0table70  0.008105  0.030722  0.052648  0.094779  0.279647
## p0table71  0.008399  0.030891  0.052929  0.095464  0.315779
## p0table72  0.008149  0.030899  0.052934  0.095537  0.300193
## p0table73  0.007252  0.030127  0.051757  0.092043  0.226904
## p0table74  0.007707  0.030541  0.051831  0.092907  0.238765
## p0table75  0.007396  0.030001  0.051610  0.092243  0.226280
## p1table1   0.000258  0.000385  0.000449  0.000515  0.000681
## p1table2   0.000276  0.000394  0.000458  0.000526  0.000703
## p1table3   0.000260  0.000386  0.000449  0.000515  0.000678
## p1table4   0.000265  0.000389  0.000452  0.000518  0.000683
## p1table5   0.000264  0.000389  0.000452  0.000518  0.000688
## p1table6   0.000258  0.000384  0.000449  0.000516  0.000684
## p1table7   0.000270  0.000392  0.000454  0.000521  0.000686
## p1table8   0.000268  0.000391  0.000454  0.000521  0.000691
## p1table9   0.000258  0.000387  0.000450  0.000515  0.000680
## p1table10  0.000260  0.000386  0.000450  0.000516  0.000679
## p1table11  0.000259  0.000384  0.000448  0.000515  0.000677
## p1table12  0.000260  0.000386  0.000449  0.000515  0.000678
## p1table13  0.000259  0.000387  0.000450  0.000516  0.000681
## p1table14  0.000262  0.000388  0.000451  0.000517  0.000682
## p1table15  0.000260  0.000385  0.000449  0.000515  0.000680
## p1table16  0.000262  0.000387  0.000450  0.000516  0.000680
## p1table17  0.000283  0.000400  0.000463  0.000530  0.000717
## p1table18  0.000276  0.000395  0.000457  0.000524  0.000703
## p1table19  0.000282  0.000400  0.000463  0.000530  0.000721
## p1table20  0.000287  0.000402  0.000464  0.000532  0.000719
## p1table21  0.000266  0.000390  0.000453  0.000519  0.000691
## p1table22  0.000260  0.000385  0.000449  0.000515  0.000680
## p1table23  0.000263  0.000389  0.000452  0.000518  0.000686
## p1table24  0.000258  0.000386  0.000449  0.000515  0.000684
## p1table25  0.000276  0.000396  0.000459  0.000526  0.000703
## p1table26  0.000261  0.000389  0.000451  0.000518  0.000684
## p1table27  0.000259  0.000385  0.000449  0.000515  0.000680
## p1table28  0.000263  0.000389  0.000452  0.000518  0.000686
## p1table29  0.000273  0.000395  0.000456  0.000524  0.000703
## p1table30  0.000257  0.000385  0.000450  0.000516  0.000676
## p1table31  0.000262  0.000387  0.000450  0.000517  0.000683
## p1table32  0.000268  0.000391  0.000454  0.000521  0.000694
## p1table33  0.000277  0.000397  0.000460  0.000527  0.000713
## p1table34  0.000260  0.000386  0.000449  0.000516  0.000682
## p1table35  0.000264  0.000387  0.000451  0.000518  0.000684
## p1table36  0.000263  0.000388  0.000451  0.000518  0.000686
## p1table37  0.000258  0.000386  0.000448  0.000515  0.000679
## p1table38  0.000277  0.000396  0.000459  0.000526  0.000705
## p1table39  0.000283  0.000400  0.000463  0.000530  0.000714
## p1table40  0.000266  0.000390  0.000453  0.000520  0.000687
## p1table41  0.000260  0.000387  0.000450  0.000515  0.000681
## p1table42  0.000262  0.000388  0.000451  0.000517  0.000682
## p1table43  0.000259  0.000385  0.000448  0.000516  0.000679
## p1table44  0.000278  0.000397  0.000460  0.000527  0.000704
## p1table45  0.000265  0.000389  0.000452  0.000519  0.000687
## p1table46  0.000263  0.000388  0.000451  0.000518  0.000685
## p1table47  0.000274  0.000394  0.000458  0.000524  0.000699
## p1table48  0.000261  0.000387  0.000450  0.000516  0.000679
## p1table49  0.000277  0.000396  0.000458  0.000525  0.000704
## p1table50  0.000267  0.000391  0.000453  0.000520  0.000689
## p1table51  0.000259  0.000387  0.000450  0.000516  0.000682
## p1table52  0.000267  0.000391  0.000454  0.000521  0.000694
## p1table53  0.000269  0.000392  0.000455  0.000521  0.000693
## p1table54  0.000262  0.000387  0.000451  0.000518  0.000689
## p1table55  0.000260  0.000385  0.000450  0.000517  0.000680
## p1table56  0.000261  0.000387  0.000451  0.000517  0.000681
## p1table57  0.000256  0.000386  0.000449  0.000516  0.000681
## p1table58  0.000274  0.000395  0.000458  0.000525  0.000704
## p1table59  0.000268  0.000391  0.000455  0.000522  0.000694
## p1table60  0.000259  0.000385  0.000449  0.000515  0.000676
## p1table61  0.000283  0.000399  0.000461  0.000528  0.000710
## p1table62  0.000272  0.000395  0.000457  0.000524  0.000698
## p1table63  0.000280  0.000399  0.000461  0.000527  0.000710
## p1table64  0.000258  0.000386  0.000449  0.000516  0.000679
## p1table65  0.000274  0.000393  0.000456  0.000522  0.000696
## p1table66  0.000266  0.000391  0.000454  0.000520  0.000690
## p1table67  0.000264  0.000387  0.000450  0.000516  0.000680
## p1table68  0.000267  0.000391  0.000454  0.000521  0.000690
## p1table69  0.000288  0.000402  0.000465  0.000533  0.000725
## p1table70  0.000282  0.000398  0.000460  0.000528  0.000710
## p1table71  0.000280  0.000398  0.000460  0.000527  0.000712
## p1table72  0.000289  0.000403  0.000466  0.000534  0.000721
## p1table73  0.000260  0.000386  0.000449  0.000515  0.000676
## p1table74  0.000259  0.000386  0.000448  0.000516  0.000679
## p1table75  0.000260  0.000387  0.000449  0.000516  0.000678
## mu0       -4.675128 -3.410300 -2.885947 -2.265954 -1.219557
## mu1       -8.101791 -7.815823 -7.697711 -7.593974 -7.400586
## sigma^2.0  0.002072  0.007243  0.018905  0.064123  4.495299
## sigma^2.1  0.001870  0.005960  0.013131  0.031202  0.156413
##
## Next step: Use 'setx' method
You can check for convergence before summarizing the estimates with three diagnostic tests. See the section Diagnostics for Zelig Models for examples of the output with interpretation:
z.out$geweke.diag()
z.out$heidel.diag()
z.out$raftery.diag()
The Wakefield hierarchical model is part of the MCMCpack package by Andrew Martin, Kevin Quinn, and Jong Hee Park. Advanced users may wish to refer to help(MCMChierEI) in the MCMCpack package.
Wakefield J (2004). “Ecological Inference for 2 x 2 Tables.” Journal of the Royal Statistical Society, Series A., 167 (3), pp. 385-445.
Martin AD, Quinn KM and Park JH (2011). “MCMCpack: Markov Chain Monte Carlo in R.” Journal of Statistical Software, 42 (9), pp. 22. <URL: http://www.jstatsoft.org/v42/i09/>.