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BUGS  2006

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Subject:

Link function

From:

Simone Ferraz Andrade de Carvalho <[log in to unmask]>

Reply-To:

Simone Ferraz Andrade de Carvalho <[log in to unmask]>

Date:

Wed, 8 Mar 2006 00:12:15 -0300

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (165 lines)

Dear Bugs Users

I'm a new WinBugs user and I'm working with binary data.
Firstly I´ve took the example of WinBugs about “Beetles: choice of link 
function” and the correspondent model program is:

	model
	{
	   for( i in 1 : N ) {
		r[i] ~ dbin(p[i],n[i])
	      logit(p[i]) <- alpha.star + beta * (x[i] - mean(x[]))
                      #p[i]<- phi(alpha.star + beta * (x[i] - mean(x[])))
	#cloglog(p[i]) <- alpha.star + beta * (x[i] - mean(x[]))
	      rhat[i] <- n[i] * p[i]
	   }
	   alpha <- alpha.star - beta * mean(x[])
	   beta ~ dnorm(0.0,0.001)
	   alpha.star ~ dnorm(0.0,0.001)	
	}

I´ve run these program using Bliss (1935) data and every thing was ok.
I need to run these same model program to another set data.
When I used logit link function it ran ok, but it doesn´t work as well as I 
wish to probit link function.

The error message is following bellow. Please could you help me with these 
question?

Best regards.

Simone

undefined real result

 Math.Ln   [0000018BH] 
	.x	REAL	-inf
 UpdaterDFreeARS.SampleHull   [00001198H] 
	.d	REAL	inf
	.h	UpdaterDFreeARS.Hull	
	  .lBounded	BOOLEAN	FALSE
	  .uBounded	BOOLEAN	FALSE
	  .n	INTEGER	23
	  .uMax	REAL	4597705.059932021
	  .yMax	REAL	-1306.553150852046
	  .lowerBound	REAL	-inf
	  .upperBound	REAL	inf
	  .x	ARRAY 51 OF REAL	Elements
	  .y	ARRAY 51 OF REAL	Elements
	  .z	ARRAY 101 OF REAL	Elements
	  .U	ARRAY 101 OF REAL	Elements
	  .expU	ARRAY 101 OF REAL	Elements
	  .dz	ARRAY 101 OF REAL	Elements
	  .I	ARRAY 101 OF REAL	Elements   
	.i	INTEGER	1
	.lower	REAL	-0.003608119902629419
	.rand	REAL	2.289103025445015E-7
	.sample	REAL	2.708217690480629E-315
	.squeeze	BOOLEAN	Undefined191
	.upper	REAL	8.15781491100198E-69
 UpdaterDFreeARS.Ars   [0000173FH] 
	.calls	INTEGER	499
	.h	UpdaterDFreeARS.Hull	Fields
	.logRand	REAL	-0.004850367932147044
	.lower	REAL	-0.003608119902629419
	.node	GraphStochastic.Node	NIL
	.res	INTEGER	0
	.sample	REAL	2.708217690480629E-315
	.squeeze	BOOLEAN	Undefined191
	.updater	UpdaterDFreeARS.Updater	[010E7A90H] 
	.upper	REAL	8.15781491100198E-69
 UpdaterDFreeARS.Updater.MCMC   [00002F00H] 
	.h	UpdaterDFreeARS.Hull	Fields
	.i	INTEGER	835468831
	.k	INTEGER	835387952
	.oldValue	REAL	0.0
	.overRelax	BOOLEAN	FALSE
	.prior	GraphStochastic.Node	[010DBAB0H] 
	.rand	REAL	-1.204323445990148
	.res	INTEGER	0
	.updater	UpdaterDFreeARS.Updater	[010E7A90H] 
	.values	POINTER	NIL
 BugsUpdaters.Updater.MCMC   [000005B8H] 
	.chain	INTEGER	0
	.depth	INTEGER	1
	.i	INTEGER	0
	.name	BugsNames.Name	[010D78A0H] 
	.ok	BOOLEAN	TRUE
	.overRelax	BOOLEAN	FALSE
	.res	INTEGER	0
	.size	INTEGER	1
	.string	ARRAY 120 OF CHAR	""   ...
	.updater	BugsUpdaters.Updater	[010E7A40H] 
 BugsSampler.MCMC   [0000036DH] 
	.chain	INTEGER	0
	.cursor	BugsSampler.List	[010E7B40H] 
	.depth	INTEGER	1
	.depth0	INTEGER	1
	.depth1	INTEGER	2
	.offset	INTEGER	2287504
	.ok	BOOLEAN	TRUE
	.overRelax	BOOLEAN	FALSE
	.updater	BugsUpdaters.Updater	[010E7A40H] 
 BugsCmds.Action.Step   [00000B29H] 
	.a	BugsCmds.Action	[01071620H] 
	.chain	INTEGER	0
	.i	INTEGER	1
	.j	INTEGER	0
	.numChains	INTEGER	1
 BugsCmds.Action.Do   [00000C62H] 
	.a	BugsCmds.Action	[01071620H] 
	.elapsedTime	LONGINT	331221FB33110384H
	.profileList	ARRAY 2024 OF CHAR	"d"   ...
	.res	INTEGER	2291454
	.s	ARRAY 120 OF CHAR	0A974X, 77D2X, 83B0X, 97X, 0A915X   ...
 Services.Exec   [00000136H] 
	.a	Services.Action	[01071620H] 
	.t	POINTER	[33110384H]
 Services.IterateOverActions   [000002F4H] 
	.p	Services.Action	[01071620H] 
	.t	POINTER	NIL
	.time	LONGINT	1061093
 Services.StdHook.Step   [0000034DH] 
	.h	Services.StdHook	[0101E380H] 
 HostWindows.Idle   [00004A86H] 
	.focus	BOOLEAN	FALSE
	.tick	Controllers.TickMsg	Fields
	.w	HostWindows.Window	NIL
 HostMenus.TimerTick   [00003422H] 
	.lParam	INTEGER	0
	.ops	Controllers.PollOpsMsg	Fields
	.wParam	INTEGER	1
	.wnd	INTEGER	131572
 Kernel.Try   [00003A61H] 
	.a	INTEGER	131572
	.b	INTEGER	1
	.c	INTEGER	0
	.h	PROCEDURE	HostMenus.TimerTick
 HostMenus.ApplWinHandler   [00003841H] 
	.Proc	PROCEDURE	NIL
	.hit	BOOLEAN	FALSE
	.lParam	INTEGER	0
	.message	INTEGER	275
	.res	INTEGER	13369344
	.s	ARRAY 256 OF SHORTCHAR	"pú""   ...
	.w	INTEGER	4243644
	.wParam	INTEGER	1
	.wnd	INTEGER	131572
<system>   (pc=77D286CAH,  fp=0022FB88H)
<system>   (pc=77D2879EH,  fp=0022FBF0H)
<system>   (pc=77D28A30H,  fp=0022FC50H)
<system>   (pc=77D2910FH,  fp=0022FCA0H)
 Kernel.Start   [00002B8CH] 
	.code	PROCEDURE	HostMenus.Loop

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