I am looking at your pdf file.

it doesn't match your description.

There are no missing values in the vectors
x, y, t.
Each vector has length 55 which is not a multiple of 4,
so we don't know where the 2x2 matrices come from.

The code doesn't run.  There are are too many "}".
PDF files are formatted and are not ascii.

Please send your code in ascii text in the body of the email.
Please pick it up from your email and paste it into
a fresh R session to be sure that it works.

Perhaps consrtruct manually an example of what you want the answer to look
like.

Rich



On Wed, Oct 24, 2012 at 3:51 AM, Loukia Spineli
<spineliloukia26@gmail.com>wrote:

> Dear all,
>
> I am trying to create a list, where each list element is a vector of
> different length arrays that contain 2by2 matrices. To be more specific
> there are 11 treatments that are compared with placebo (we have 11
> comparisons) and each comparison is studied by a different number of trials
> and each trial has a different number of missing participants in both arms.
> The length of the list is equal to the number of comparisons. In each
> comparison the number of arrays is equal to the number of trials that study
> this comparison. For instance 4 trials compare PAR with placebo. So, for
> this comparison we have 4 arrays and each array has a length equal to the
> producy of the number of participants in each arm. These arrays contain 2x2
> matrices.
>
> I have attached a document with the data and the code. I cannot create the
> list results the way I have described above. It creates only the  matrices
> for the first array (that has length equal to 135) of the first comparison
> leaving the rest 10 comparisons "NULL".
> Any suggestion would be  really helpful
>
> Thank you in advance,
> Loukia
>
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>
>

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