% 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