dear will and list,
i have been facing the same problem as thio kellerman ( see post below).
i am trying to use Bayesian estimation for a two-sample t-test at the group
level. the OLS estimation works fine but the bayesian estimation gives the
following error message with the debugger.
(i am using matlab 6.5)
---------------------
PEB Iteration : 3 ...2.825956e-04
Non-sphericity : ...REML estimation
??? Conversion to unknown from double is not possible.
Error in ==> /app/spm2/spm_spm_Bayes.m
On line 338 ==> PPM.Cb(v,v) = P{2}.C(j,j);
K>>
------------------
i would be extremely grateful for any help/suggestion,
bhisma
On Thu, 9 Sep 2004 12:15:02 +0100, Will Penny <[log in to unmask]> wrote:
>Thilo Kellermann wrote:
>
>> Dear SPMers,
>>
>> I would like to claculate PPMs for a 2nd level group analysis and the
function
>> spm_spm_Bayes.m seems to work fine until fitting the model and writing the
>> parameter images. I guess it is right after the beginning of the post
>> estimation when the function crashes and returns the error message pasted
>> below. Does anybody know what might have gone wrong and how to proceed with
>> post estimation?
>>
>> Thanks a lot,
>> Thilo
>>
>> ------------------------------------
>>
>> PEB Iteration : 2 ...2.564839e-05
>> PEB Iteration : 1 ...2.969170e-01
>> PEB Iteration : 2 ...1.684169e-05
>> PEB Iteration : 1 ...9.235810e-02
>> PEB Iteration : 2 ...4.617268e-06
>>
>> Non-sphericity : ...REML estimation
>> ??? Error while evaluating uicontrol Callback.
>>
>>
>> ??? Conversion to unknown from double is not possible.
>>
>> Error in ==> /nfsusr/local/SPM/spm2/spm_spm_Bayes.m
>> On line 338 ==> PPM.Cb(v,v) = P{2}.C(j,j);
>>
>>
>
>
>Is this the first time you've used PPM analysis ? Did it work before on
>other data ?
>
>What version of matlab are you running ?
>
>This is the first time PPM.Cb is referred to so I'm wondering if later
>versions of matlab require you to declare variables in some way - only a guess.
>
>What is your second level design matrix ? Just a column of 1's ?
>
>To really find out what's happening you'll need to use the debugger.
>Type 'dbstop if error' in the command window before pressing the Bayesian
button.
>Then see if there are problems with any of the variables.
>
>Best, Will.
