[pymvpa] dataset issue

[David Soto]

Thanks Yaroslav, however what concerns me the most is the initial output of data summary with the number of targets per chunk, those numbers seem non sense,  as there are 588 trials there are not 
14406 targets per chunk? thanks!

>>> print alldata.summary()

Dataset: 588x6 at float64, <sa: chunks,targets>
stats: mean=nan std=nan var=nan min=nan max=nan

Counts of targets in each chunk:
  chunks\targets   1     2
                  ---   ---
        0        14406 14406
        1        14406 14406
        2        14406 14406
        3        14406 14406
        4        14406 14406
        5        14406 14406
        6        14406 14406
        7        14406 14406
        8        14406 14406
        9        14406 14406
       10        14406 14406
       11        14406 14406

Summary for targets across chunks
  targets   mean   std    min      max   #chunks
    1     1.44e+04  0  1.44e+04 1.44e+04    12
    2     1.44e+04  0  1.44e+04 1.44e+04    12

Summary for chunks across targets
  chunks   mean   std    min      max   #targets
    0    1.44e+04  0  1.44e+04 1.44e+04     2
    1    1.44e+04  0  1.44e+04 1.44e+04     2
    2    1.44e+04  0  1.44e+04 1.44e+04     2
    3    1.44e+04  0  1.44e+04 1.44e+04     2
    4    1.44e+04  0  1.44e+04 1.44e+04     2
    5    1.44e+04  0  1.44e+04 1.44e+04     2
    6    1.44e+04  0  1.44e+04 1.44e+04     2
    7    1.44e+04  0  1.44e+04 1.44e+04     2
    8    1.44e+04  0  1.44e+04 1.44e+04     2
    9    1.44e+04  0  1.44e+04 1.44e+04     2
   10    1.44e+04  0  1.44e+04 1.44e+04     2
   11    1.44e+04  0  1.44e+04 1.44e+04     2
Sequence statistics for 588 entries from set [1, 2]
Counter-balance table for orders up to 2:
Targets/Order  O1      |   O2      |
      1:      163 130  |  142 151  |
      2:      130 164  |  150 143  |
Correlations: min=-0.13 max=0.12 mean=-0.0017 sum(abs)=21

----- Original Message -----
From: "Yaroslav Halchenko" <debian at onerussian.com>
To: "Development and support of PyMVPA" <pkg-exppsy-pymvpa at lists.alioth.debian.org>
Sent: Monday, April 10, 2017 3:33:52 AM
Subject: Re: [pymvpa] dataset issue

On Mon, 10 Apr 2017, David Soto wrote:

>    HI, I am trying to create a dataset comprised of vectors of behavioural
>    data for classification
>    It all seems OK but when I check the output summary() the counts of
>    targets in each chunk is not right (total should be around 590) 
>    however the 
>    Sequence statistics for 588 entries from set [1, 2] seems fine?
>    Counter-balance table for orders up to 2:
>    Targets/Order O1 | O2 |
>    1: 163 130 | 142 151 |
>    2: 130 164 | 150 143 |

you have 11 chunks

you can't estimate O1 for the first trial 

588-1 = 587 for O1 which matches 163+130+130+164, similarly for O2
-- two trials are dropped and you have 586

>    There may be something going on in the way I prepare the dataset.
-- 
Yaroslav O. Halchenko
Center for Open Neuroscience     http://centerforopenneuroscience.org
Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755
Phone: +1 (603) 646-9834                       Fax: +1 (603) 646-1419
WWW:   http://www.linkedin.com/in/yarik        

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