% MacrosBasic May 16, 2005\input MacrosMac\def\b#1{\hbox{\bmath $#1$}}\def\smb#1{{\fsize{9}\b{#1}}}\def\mft#1{\hbox{\mf $#1$}}\def\sm#1{{\fsize{9}\mft{#1}}}% Time and date\def\today{\ifcase\month\or   January\or February\or March\or April\or May\or June\or   July\or August\or September\or October\or November\or   December\fi\space\number\day, \number\year}\def\hour{\num=\time \divide\num by60 \number\num h\     \multiply\num by 60 \np=\time \advance\np by-\num\number\np}\def\dated{\ff\vskip-30mm\nid Typesetted on \today, at \hour\vskip30mm}% Style definitions\def\hugeskip{\vskip18pt plus6pt minus6pt}\def\Hugeskip{\vskip24pt plus8pt minus6pt}\def\closeup#1{\nobreak\ff\vskip-#1\baselineskip\nobreak}\let\ce=\centerline\def\bqo{\begingroup\fsize{10}\medbreak\narrower}\def\bqos#1#2{\begingroup\fsize{#1}\parindent#2mm\medbreak\narrower}\def\eqo{\medbreak\endgroup}\def\rule{\medskip\hrule\medskip}\let\ph=\phantom\let\bgr=\begingroup\let\egr=\endgroup\def\nid{\noindent\ignorespaces}\def\0{\hfil\break}\def\w#1{\hbox{#1}}\def\wq#1{\quad\hbox{#1}\quad}\def\blistp#1{\smallskip\begingroup\parindent#1pt\parskip0pt}\def\blist{\blistp{20}}\def\elist{\par\endgroup\smallskip}\def\ite#1{\smallbreak\item{{#1}}\ignorespaces}\def\iteb#1{\item{{\bf #1}}\ignorespaces}\def\itt#1{\smallbreak\itemitem{{#1}}\ignorespaces}\def\itebul{\smallbreak\ite{$\bullet$}\ignorespaces}\def\ittbul{\smallbreak\itt{$\bullet$}\ignorespaces}\def\bdir{\vskip\parskip\begingroup\obeylines\parskip0pt}\def\edir={\endgroup\vskip\parskip}\newcount\nueq\nueq=0\def\eq#1{\advance\nueq by1\vskip4pt plus1pt   \leftline{$\displaystyle{#1}\hfill(\number\nueq)$}\vskip1pt plus1pt\0\noindent}\def\ok{\nobreak\quad\lower.5ex\hbox{$\triangleleft$} \bigbreak}\def\leftok{\par\vskip-4mm\hfill$\triangleleft$\medskip}% Special character definitions\def\bul{$\bullet$~}\let\ff=\strut\let\union=\cup\let\inter=\cap\def\m#1{\;\raise2pt\hbox{#1}}\def\boxit#1#2#3{\leavevmode\hbox{\vrule\vtop{\vbox{\hrule\kern#3pt     \hbox{\kern#2pt{#1}\kern#2pt}}\kern#3pt\hrule}\vrule}}\def\rect#1{\boxit{#1}{2}{2}}\def\up#1#2#3#4{\hskip2mm\hbox{$#1$}               \kern-#3mm\raise#4mm\hbox{$#2$}\hskip2mm}% Abbreviations\def\etal{{\it et al.\ }}\def\etalc{{\it et al., }}\def\ie{{\it i.e.},\ }\def\eg{{\it e.g.},\ }\def\row#1#2{\hbox{${#1}_1,\ldots,{#1}_{#2}$}}\def\data{\row{x}{n}}\def\bdata{\{\row{x}{n}\}}\def\brow#1#2{\hbox{$\{{#1}_1,\ldots,{#1}_{#2}\}$}}\def\range#1#2{\hbox{${#1},\ldots,{#2}$}}\def\brange#1#2{\hbox{$\{{#1},\ldots,{#2}\}$}}% General Mathematics\def\conv{\mathop{\to}}\def\plim{\mathop{\rm plim}}\def\blim{\mathop{\rm blim}}\def\sech{\mathop{\rm sech}}\def\tr{\mathop{\rm tr}}\def\diag{\mathop{\rm diag}}\def\barx{\hbox{$\overline x$}}\def\bary{\hbox{$\overline y$}}\def\frac#1#2{{#1\over#2}}\def\ontop#1#2{{#1\atop#2}}\def\comb#1#2{{#1\choose#2}}\def\g{\,\vert\,}\def\dd#1{\,d#1}\def\indic#1{\hbox{$\,\b{1}_{#1}\,$}}\def\h{\hbox{$1\over2$}}\def\hh#1#2{\hbox{$#1\over#2$}}\def\bfuno{\hbox{{\bf 1}}}% Functions\def\fn#1{\hbox{{\tf#1}}}\def\Pr{\fn{Pr}}\def\P{\fn{P}}\def\D{\fn{D}}\def\E{\fn{E}}\def\Mo{\fn{Mo}}\def\Me{\fn{Me}}\def\Cov{\fn{Cov}}\def\Var{\fn{Var}}\def\Corr{\fn{Corr}}\def\Q{\fn{Q}}% Distributions\def\fni#1{\hbox{{#1}}}\def\Bb{\fni{Bb}}\def\Be{\fni{Be}}\def\Bi{\fni{Bi}}\def\Br{\fni{Br}}\def\Ca{\fni{Ca}}\def\Cef{\fni{Cef}}\def\Di{\fni{Di}}\def\Ef{\fni{Ef}}\def\Ex{\fni{Ex}}\def\Fs{\fni{Fs}}\def\Ga{\fni{Ga}}\def\Ge{\fni{Ge}}\def\Gg{\fni{Gg}}\def\Hy{\fni{Hy}}\def\Ig{\fni{Ig}}\def\Ip{\fni{Ip}}\def\Lo{\fni{Lo}}\def\Md{\fni{Md}}\def\Mu{\fni{Mu}}\def\N{\fni{N}}\def\Nb{\fni{Nb}}\def\Nbb{\fni{Nbb}}\def\Ng{\fni{Ng}}\def\Nw{\fni{Nw}}\def\Pa{\fni{Pa}}\def\Po{\fni{Po}}\def\Pg{\fni{Pg}}\def\Pn{\fni{Pn}}\def\Ra{\fni{Ra}}\def\St{\fni{St}}\def\Un{\fni{Un}}\def\Wi{\fni{Wi}}% Tables\let\\=\cr\def\tsize#1{\font\ftit=HelveticaB at #1pt}\def\cta#1{{\fsize{10}\vskip-2\baselineskip\baselineskip=10pt\ff            \tabskip=2em$$\vbox{\ialign            {\hfil##\hfil&&\quad\hfil##\hfil\crcr#1\crcr}}$$}}\def\lta#1{{\fsize{10}\vskip-2\baselineskip\baselineskip=10pt\ff            \tabskip=2em$$\vbox{\ialign            {##\hfil&&\quad##\hfil\crcr#1\crcr}}$$}}\def\rta#1{{\fsize{10}\vskip-2\baselineskip\baselineskip=10pt\ff            \tabskip=2em$$\vbox{\ialign            {\hfil##&&\quad\hfil##\crcr#1\crcr}}$$}}\def\btab#1{{\fsize{10}\baselineskip=11pt             \tabskip=2em$\vbox{\ialign             {\hfil##&&\quad\hfil##\crcr#1\crcr}}$}}\def\btam#1#2{\ff\hskip#1mm\btab{#2}}\let\bta=\rta\def\trules{\noalign{\vskip2mm\hrule\vskip2mm}}\def\tab{\ff\hskip\parindent}%reference abbreviations\def\aps#1{{\it Appl.\ Sta\-tist.~}{\bf#1}}\def\ap#1{{\it Ann.\ Prob.~}{\bf#1}}\def\apsy#1{{\it Acta Psycho\-logica~}{\bf#1}}\def\as#1{{\it Ann.\ Sta\-tist.~}{\bf#1}}\def\aism#1{{\it Ann.\  Inst.\ Sta\-tist.\ Math.~}{\bf#1}}\def\ams#1{{\it Ann.\ Math.\ Sta\-tist.~}{\bf#1}}\def\amst#1{{\it Amer.\ Sta\-tist.~}{\bf#1}}\def\amsc#1{{\it Amer.\ Scien\-tist.~}{\bf#1}}\def\arp#1{{\it Annual Rev.\ Psycho\-logy~}{\bf#1}}\def\bell#1{{\it Bell Systems Tech. J.~}{\bf#1}}\def\be#1{{\it Bernoulli~}{\bf#1}}\def\bhk#1{{\it Behaviormetrika~}{\bf#1}}\def\bisi#1{{\it Bull. Internat.\ Sta\-tist.\ Institute~}{\bf#1}}\def\bk#1{{\it Bio\-metrika~}{\bf#1}}\def\bc#1{{\it Bio\-metrics~}{\bf#1}}\def\bjmsp#1{{\it British J. Math.\ Statist.\ Philosophy~}{\bf#1}}\def\bjps#1{{\it British J. Philosophy Sci~}{\bf#1}}\def\bsci#1{{\it Behavioral Sci.~}{\bf#1}}\def\chance#1{{\it Chance~}{\bf#1}}\def\cm#1{{\it Contemporary Mathematics~}{\bf#1}}\def\cjs#1{{\it Canadian J. Sta\-tist.~}{\bf#1}}\def\comp#1{{\it Computing~}{\bf#1}}\def\crasp#1{{\it C.\ R.\ Acad. Sci. Paris~}{\bf #1}}\def\cstm#1{{\it Comm.\ Sta\-tist. Theory and Methods~}{\bf #1}}\def\csda#1{{\it Comput. Sta\-tist. and Data Analysis~}{\bf #1}}\def\cssc#1{{\it Comm.\ Sta\-tist. Simulation and Computation~}{\bf #1}}\def\ds#1{{\it Decision Sciences~}{\bf #1}}\def\eca#1{{\it Econo\-me\-trica~}{\bf#1}}\def\ecj#1{{\it Econometrics Journal~}{\bf#1}}\def\ecr#1{{\it Econometric Reviews~}{\bf#1}}\def\ect#1{{\it Econometric Theory~}{\bf#1}}\def\ee#1{{\it Es\-ta\-dist.\ Espa\-ñola~}{\bf#1}}\def\ejor#1{{\it  Eur. \ J.~Oper.\  Res.~}{\bf#1}}\def\fareast#1{{\it Far East J.~Math.~Sci.~}{\bf#1}}\def\ieac#1{{\it IEEE Trans.\ Automatic Control~}{\bf#1}}\def\ieit#1{{\it IEEE Trans.\ Information Theory~}{\bf#1}}\def\iepami#1{{\it IEEE Trans.\ Patt. Anal. Mach. Intelligence~}{\bf#1}}\def\iessc#1{{\it IEEE Trans.\ Systems, Science and Cybernetics~}{\bf#1}}\def\isc#1{{\it Information Sciences~}{\bf#1}}\def\isi#1{{\it Internat.\ Sta\-tist.\ Rev.~}{\bf#1}}\def\jae#1{{\it J.~Appl.\ Econometrics~}{\bf#1}}\def\jap#1{{\it J.~Appl.\ Probability~}{\bf#1}}\def\jas#1{{\it J.~Appl.\ Sta\-tist.~}{\bf#1}}\def\jasa#1{{\it J.~Amer.\ Sta\-tist.\ Assoc.~}{\bf#1}}\def\jbus#1{{\it J.~Business~}{\bf#1}}\def\jbes#1{{\it J.~Business and Economic Statis\-tics~}{\bf#1}}\def\jche#1{{\it J.~Chemometrics~}{\bf#1}}\def\jcgs#1{{\it J.~Comp.\ Graph.\ Sta\-tist.~}{\bf #1}}\def\jcsda#1{{\it J.~Comp.~Sta\-tist.\ and Data Analysis~}{\bf#1}}\def\je#1{{\it J.~Econometrics~}{\bf#1}}\def\jeco#1{{\it J. Economic Theory~}{\bf#1}}\def\jiact#1{{\it J.~Inst. Actuaries~}{\bf#1}}\def\jit#1{{\it J.~It. Sta\-tist.\ Soc.~}{\bf#1}}\def\jirss#1{{\it J.~Iranian Sta\-tist.\ Soc.~}{\bf#1}}\def\jma#1{{\it J.~Multivariate Analysis~}{\bf#1}}\def\jme#1{{\it J.~of Monetary Economics~}{\bf#1}}\def\jmc#1{{\it J.~Multi-Criteria Dec. Analysis~}{\bf#1}}\def\jf#1{{\it J.~Fore\-casting~}{\bf#1}}\def\jrssa#1{{\it J.~Roy.\ Sta\-tist.\ Soc.~A~}{\bf#1}}\def\jrssb#1{{\it J.~Roy.\ Sta\-tist.\ Soc.~B~}{\bf#1}}\def\jpol#1{{\it J.~Political Economy~}{\bf#1}}\def\jpsy#1{{\it J.~of Psychology~}{\bf#1}}\def\jqt#1{{\it J.~ Qual. Technol.~}{\bf#1}}\def\jru#1{{\it J.~Risk and Uncertainty~}{\bf#1}}\def\jspi#1{{\it J.~Sta\-tist.\ Planning and Inference~}{\bf#1}}\def\jscs#1{{\it J.~Sta\-tist.\ Computation and Simulation~}{\bf#1}}\def\jtsa#1{{\it J.~Time Series Analysis~}{\bf#1}}\def\madrid#1{{\it Rev.\ Acad.\ Cien\-cias Madrid~}{\bf#1}}\def\mafi#1{{\it Mathematical Finance~}{\bf#1}}\def\me#1{{\it Metron~}{\bf#1}}\def\mk#1{{\it Metrika~}{\bf#1}}\def\msci#1{{\it Manag.\ Sci.~}{\bf#1}}\def\mst#1{{\it Math.\ Scientist~}{\bf#1}}\def\nat#1{{\it Nature~}{\bf#1}}\def\op#1{{\it Operations Research~}{\bf#1}}\def\paris#1{{\it Pub.\ Inst.\ Sta\-tist.\ Univ.\ Paris~}{\bf#1}}\def\pcps#1{{\it Proc.\ Camb.\ Phil.\ Soc.~}{\bf#1}}\def\phil#1{{\it Phil. Trans. Roy. Soc. London A~}{\bf#1}}\def\pieee#1{{\it Proc.\ of the IEEE~}{\bf#1}}\def\proy#1{{\it Proc. Roy. Soc. A~}{\bf#1}}\def\psa#1{{\it Psychometrika~}{\bf#1}}\def\psybul#1{{\it Psychological Bul.~}{\bf#1}}\def\questio#1{{\it Qüestiió~}{\bf#1}}\def\racmad#1{{\it Rev.\ Acad.\ Ciencias de Madrid~}{\bf#1}}\def\rmcm#1{{\it Rev.\ Mat.\ Univ.\ Complutense de Madrid~}{\bf#1}}\def\sci#1{{\it Science~}{\bf#1}}\def\sjs#1{{\it Scandinavian J.\ Sta\-tist.~}{\bf#1}}\def\ska#1{{\it Sankhy$\overline{a}$~A~}{\bf#1}}\def\skb#1{{\it Sankhy$\overline{a}$~B~}{\bf#1}}\def\sc#1{{\it Sta\-tist.\ Computing~}{\bf#1}}\def\scw#1{{\it Social Choice and Welfare~}{\bf#1}}\def\sasj#1{{\it South African Statist. J.~}{\bf#1}}\def\sd#1{{\it Statis\-tics and Decisions~}{\bf#1}}\def\spl#1{{\it Statis\-tics \& Probability Letters~}{\bf#1}}\def\stsc#1{{\it Sta\-tist.\ Sci.~}{\bf#1}}\def\st#1{{\it The Sta\-tistician~}{\bf#1}}\def\stne#1{{\it Sta\-tistica Neerlandica~}{\bf#1}}\def\stsin#1{{\it Sta\-tistica Sinica~}{\bf#1}}\def\stat#1{{\it  Sta\-tistica~}{\bf#1}}\def\stmed#1{{\it  Sta\-tist. in Medicine~}{\bf#1}}\def\stpa#1{{\it  Stochastic Proc. and Applications~}{\bf#1}}\def\te#1{{\it Test~}{\bf#1}}\def\tc#1{{\it Techno\-metrics~}{\bf#1}}\def\td#1{{\it Theory and Decision~}{\bf#1}}\def\top#1{{\it Top~}{\bf#1}}\def\tra#1{{\it Trab.\ Esta\-dist.~}{\bf#1}}\def\traio#1{{\it Trab.\ Invest.\ Opera\-tiva~}{\bf#1}}\def\qu#1{{\it Q{\"u}estiió~}{\bf#1}}\let\ss=\stsc\def\trepn#1#2{{\it Tech. Rep.~}{\bf #1},~#2.}\def\trep#1{{\it Tech. Rep.},~#1.}\def\phd#1{Ph.D. Thesis,~#1.}\def\msc#1{M.Sc. Thesis,~#1.}\def\this{{\it In this volume}.}\def\diss{(with discussion). }\def\appear{(to appear). }\def\academic{New York: Academic Press}\def\addison{Reading, MA: Addison-Wesley}\def\arnold{London: Edward Arnold}\def\blackwell{Oxford: Blackwell}\def\california{Berkeley: Univ. California Press}\def\cambridge{Cambridge: University Press}\def\chapman{London: Chapman and Hall}\def\chelsea{New York: Chelsea}\def\chicago{Chicago: University Press}\def\columbia{Columbia, SC: University Press}\def\dekker{New York: Marcel Dekker}\def\elgar{Brookfield, VT: Edward Elgar}\def\elsevier{Amsterdam: Elsevier}\def\dover{New York: Dover}\def\ellis{Chichester: Ellis Horwood}\def\griffin{London: Griffin}\def\irwin{Homewood, IL: Irwin}\def\kluwer{Dordrecht: Kluwer}\def\krieger{Melbourne, FL: Krieger}\def\harvard{Harvard, MA: University Press}\def\holden{San Francisco, CA: Holden-Day}\def\holt{Toronto: Holt, Rinehart and Winston}\def\hopkins{Baltimore: John Hopkins University Press}\def\ims{Hayward, CA: IMS}\def\mcgraw{New York: McGraw-Hill}\def\methuen{London: Methuen}\def\mit{Cambridge, MA: The MIT Press}\def\macmillan{London: Macmillan}\def\morgan{Amsterdam: Morgan-Kaufmann Pub.}\def\north{Amsterdam: North-Holland}\def\oxford{Oxford: Oxford University Press}\def\peter{Gloucester, MA: Peter Smith}\def\pergamon{New York: Pergamon}\def\plenum{London: Plenum}\def\prentice{Englewood Cliffs, NJ: Prentice-Hall}\def\princeton{Princeton: University Press}\def\reidel{Dordrecht: Reidel}\def\sage{Beverly Hills, CA: Sage}\def\siam{Philadelphia, PA: SIAM}\def\stanford{Stanford: University Press}\def\springer{Berlin: Springer}\def\springerny{New York: Springer}\def\vannostrand{New York: Van Nostrand}\def\wadsworth{Pacific Drove, CA: Wadsworth}\def\wiley{Chichester: Wiley}\def\wileyny{New York: Wiley}\def\val#1{\ifcase#1   \or {\it Bayesian Statis\-tics}    (J.~M.~Ber\-nar\-do, M.~H.~DeGroot, D.~V.~Lind\-ley and     A.~F.~M. Smith, eds.) Va\-len\-cia: University Press%    \or {\it Bayesian Statis\-tics~2}    (J.~M.~Ber\-nar\-do, M.~H.~DeGroot, D.~V.~Lind\-ley and     A.~F.~M. Smith, eds.), Ams\-ter\-dam: North-Holland%    \or {\it Bayesian Statis\-tics~3}    (J.~M.~Ber\-nar\-do, M.~H.~DeGroot, D.~V.~Lind\-ley and     A.~F.~M. Smith, eds.) Oxford: University Press%    \or {\it Bayesian Statis\-tics~4}    (J.~M.~Ber\-nar\-do, J.~O.~Ber\-ger, A.~P.~Dawid and     A.~F.~M. Smith, eds.) Oxford: University Press%    \or {\it Bayesian Statis\-tics~5}    (J.~M.~Ber\-nar\-do, J.~O.~Ber\-ger, A.~P.~Dawid and     A.~F.~M. Smith, eds.) Oxford: University Press%    \or {\it Bayesian Statis\-tics~6}    (J.~M.~Ber\-nar\-do, J.~O.~Ber\-ger, A.~P.~Dawid and     A.~F.~M. Smith, eds.) Oxford: University Press%    \or {\it Bayesian Statis\-tics~7}    (J.~M.~Ber\-nar\-do, M.~J.~Bayarri, J.~O.~Ber\-ger, A.~P.~Dawid,     D.~Heckerman, A.~F.~M. Smith  and M.~West, eds.)     Oxford: University Press\fi}\def\berk#1#2{\ifcase#1   \or {\it Proc. First Berkeley Symp.}    (J.~Neyman ed.) \california%   \or {\it Proc. Second Berkeley Symp.}    (J.~Neyman ed.) \california%   \or {\it Proc. Third Berkeley Symp.}~{\bf#2}    (J.~Neyman  and E.~L.~Scott, eds.) \california%   \or {\it Proc. Fourth Berkeley Symp.}~{\bf#2}    (J.~Neyman  and E.~L.~Scott, eds.) \california%   \or {\it Proc. Fifth Berkeley Symp.}~{\bf#2}    (L.~M.~LeCam and J~Neyman, eds.) \california\fi}\def\purdue#1#2{\ifcase#1\or    {\it Statistical Decision Theory and Related Topics}     (S.~S.~Gupta and J.~Yackel, eds.) \academic%    \or {\it Statistical Decision Theory and Related Topics II}     (S.~S.~Gupta and D. S.~Moore, eds.) \academic%    \or {\it Statistical Decision Theory and Related Topics III}~{\bf#2}    (S.~S.~Gupta and J.~O.~Berger, eds.) \academic%    \or {\it Statistical Decision Theory and Related Topics IV}~{\bf#2}    (S.~S.~Gupta and J.~O.~Berger, eds.) \springer%    \or {\it Statistical Decision Theory and Related Topics V}    (S.~S.~Gupta and J.~O.~Berger, eds.) \springer\fi}\def\casebayes#1{\ifcase#1\or    {\it Case Studies in Bayesian Statis\-tics}     (C.~Gatsonis, J.~Hodges, R.~Kass and N.~Singpurwalla, eds.)    \springerny    \or {\it Case Studies in Bayesian Statis\-tics II}     (C.~Gatsonis, J.~Hodges, R.~Kass and N.~Singpurwalla, eds.)    \springerny     \or {\it Case Studies in Bayesian Statis\-tics III}    (C.~Gatsonis, J.~Hodges, R.~Kass, R.~McCulloch, P.~Rossi and    N.~Singpurwalla, eds.) \springerny    \or {\it Case Studies in Bayesian Statis\-tics IV}    (C.~Gatsonis, R.~Kass, B.~Carlin, A.~Carriquiry, A.~Gelman,     I.~Verdinelli and M.~West, eds.) \springerny    \or {\it Case Studies in Bayesian Statis\-tics V}    (C.~Gatsonis, R.~Kass, B.~Carlin, A.~Carriquiry, A.~Gelman,     I.~Verdinelli and M.~West, eds.) \springerny    \or {\it Case Studies in Bayesian Statis\-tics VI}    (A.~Carriquiry, A.~Gelman, D.~Higdon, R.~Kass, D.~Pauler and     I.~Verdinelli, eds.) \springerny\fi}\def\innsbruck{{\it Probability and Bayesian Statis\-tics}    (R.~Viertl, ed.) \plenum}\def\fbleau{{\it New Developments in the Applications of Bayesian Methods}    (A.~Aykaç and C.~Brumat, eds.) \north}\def\india{{\it Bayesian Analysis in Statis\-tics and Econometrics}    (P.~K.~Goel and N.~S.~Iyengar, eds.) \springer}\def\louvain{{\it Model Choice}    (J.-P.~Florens, M.~Mouchart, J.-P.~Raoult and L.~Simar, eds.)    Brussels: Pub. Fac. Univ. Saint Louis}\def\waterloo{{\it Foundations of Statistical Inference}    (V.~P.~Godambe and D.~A.~Sprott, eds.) \holt}\def\barnard{{\it Bayesian and Likelihood Methods in Statis\-tics andEconometrics:    Essays in Honor of George A.~Barnard}    (S.~Geisser, J.~S.~Hodges, S.~J.~Press and A.~Zellner, eds.) \north}\def\basu{ {\it Current Issues in Statistical Inference: Essays inHonor of D.~Basu}.    (M.~Ghosh and  P.~K.~Pathak eds.) Hayward, CA: IMS}\def\definetti{{\it Bayesian Inference and Decision Techniques:    Essays in Honor of Bruno de~Finetti}    (P.~K.~Goel and A.~Zellner, eds.) \north}\def\geisser{{\it Modelling and Prediction:    Essays in Honor of Seymour Geisser}    (J. C. Lee \etal, eds.) \springerny}\def\jeffreys{{\it Bayesian Analysis in Econometrics and Statis\-tics:    Essays in Honor of Harold Jeffreys}    (A.~Zellner, ed.) \north}\def\lindley{{\it Aspects of Uncer\-tainty:    a Tribute to D.~V.~Lindley}    (P.~R.~Freeman, and A.~F.~M. Smith, eds.) \wiley}\def\neyman{{\it Research Papers in Statis\-tics. Festschrift for J.~Neyman}   (F.~N.~David, ed.) \wileyny}\def\savage{{\it Studies in Bayesian Econometrics and Statis\-tics:    in Honor of Leonard J.~Savage}    (S.~E.~Fienberg and A.~Zellner, eds.) \north}\def\lindley{{\it Aspects of Uncertainty:    a Tribute to D.~V.~Lindley}    (P.~R.~Freeman and A.~F.~M. Smith, eds.) \wiley}\def\zellner{{\it Bayesian Analysis in Statis\-tics and Econometrics:    Essays in Honor of Arnold~Zellner}    (D.~A.Berry, K.~M.~Chaloner and J.~K.~Geweke, eds.) \wileyny}\def\bayesian{{\it Bayesian Inference}    (N.~G.~Polson and G.~C.~Tiao, eds.) \elgar}\def\induction{{\it Probability, Induction and Statis\-tics}      \wileyny}\def\montecarlo{{\it Markov Chain Monte Carlo in Practice}    (W.~R.~Gilks, S.~Richardson  and D. J. Spiegelhalter, eds.) \chapman}\def\robust{{\it Robustness of Bayesian Analysis}    (J.~B.~Kadane, ed.) \north}\def\scientific{{\it Scientific Inference, Data Analysis and Robustness}    (G.~E.~P. Box, T.~Leonard and C.~F.~Wu,  eds.) \academic}\def\survey{{\it New Developments in Survey Sampling}    (N.~L.~Johnson and H.~Smith~Jr., eds.) \wileyny}\def\subjective{{\it Studies in Subjective Probability}    (H.~E.~Kyburg and H.~E~Smokler, eds.) \dover}\def\timeseries{{\it Bayesian Analysis of Time series and Dynamic Models}    (J.~C.~Spall, ed.) \dekker}\def\encyc#1{{\it Encyclopedia of Statistical Sciences}~{\bf#1}    (S.~Kotz,  N.~L.~Johnson and C.~B.~Read, eds.) \wileyny}\def\encss#1{{\it Internat. Encyclopedia of the Social Sciences}~{\bf#1}.     \macmillan}\def\breaks#1{{\it Breakthroughs in Statis\-tics}~{\bf#1}    (S.~Kotz and N.~L.~Johnson, eds.) \springer}\def\multiv#1{{\it Multivariate Analysis}~{\bf#1}    (P.~R.~Krishnaiah, ed.) \academic}\def\multivn#1{{\it Multivariate Analysis}~{\bf#1}    (P.~R.~Krishnaiah, ed.) \north}\def\bayesbiostat{{\it Bayesian Biostatistics}~    (Berry, D.~A. and Stangl, D.~K., eds.) \dekker}\def\handbook{{\it Bayesian Thinking: Modeling and Compu\-tation,    Handbook of Statis\-tics}~{\bf  25}    (Dey, D.~K. and Rao, C.~R., eds.) \elsevier}\def\diss{(with discussion). }\def\dissE{(con discusi—n). }\def\appear{(to appear). }\def\appeardiss{(to appear, with discussion). }\standard%\dump