[R] Longitudinal Factor Analysis

[ilai]

?factanal
There is also package sem (structural equations model) by John Fox.

I'm sure there are more (maybe more fitting your situation) but these
two came to mind first...

Cheers


On Sun, Feb 12, 2012 at 6:51 AM, Gregory Gilbert
<g.eastham.gilbert at gmail.com> wrote:
> I have a data set in the format below. I would like to perform a factor
> analysis on BM1-BM20 as they are 20 biomechanical measurements of the trial
> (hitting a baseball). However, my observations are not independent and, I
> assume, I have to account for this. I have consulted the R literature via
> RSeek and Google (and I have consulted some very knowledgeable colleagues)
> and cannot find any method of doing this in R. Is someone aware of a method
> of reducing the 20 biomechanical measurements?
>
> Thank you for your help.
>
> Greg
>
> ID    PitchType    Location    SwingNumber      BM1...BM20      Hit
> Velocity
> 1     Fastball        1            1            xx  ... xx       1
> 62
> 1     Fastball        1            2            xx  ... xx       1
> 68
> 1     Fastball        1            3            xx  ... xx       0
> 1     Fastball        1            4            xx  ... xx       0
> 1     Fastball        1            5            xx  ... xx       1
> 71
> 1     Fastball        2            1            xx  ... xx       0
> 1     Fastball        2            2            xx  ... xx       1
> 61
> 1     Fastball        2            3            xx  ... xx       1
> 64
> 1     Fastball        2            4            xx  ... xx       1
> 59
> 1     Fastball        2            5            xx  ... xx       0
> 1     Fastball        2            6            xx  ... xx       0
> 1     Fastball        2            7            xx  ... xx       0
> 1     Fastball        2            8            xx  ... xx       0
> 1     Fastball        3            1            xx  ... xx       1
> 78
> 1     Fastball        3            2            xx  ... xx       0
> 1     Fastball        3            3            xx  ... xx       1
> 74
> 1     Fastball        4            1            xx  ... xx       0
> 1     Fastball        4            2            xx  ... xx       1
> 69
> 1     Fastball        4            3            xx  ... xx       1
> 72
> 1     Fastball        4            4            xx  ... xx       1
> 65
> 1     Fastball        4            5            xx  ... xx       0
> 1     Fastball        4            6            xx  ... xx       0
> 1     Fastball        4            7            xx  ... xx       0
> 1     Fastball        4            8            xx  ... xx       1
> 74
> 1     Fastball        4            9            xx  ... xx       1
> 78
> 1     Fastball        4            10           xx  ... xx       1
> 76
> 1     Fastball        5            1            xx  ... xx       0
> 1     Fastball        5            2            xx  ... xx       1
> 53
> 1     Fastball        5            3            xx  ... xx       0
> 1     Fastball        5            4            xx  ... xx       1
> 51
> 1     Fastball        5            5            xx  ... xx       0
> 1     Fastball        5            6            xx  ... xx       1
> 55
> .
> .
> .
> 40    Fastball        5            1            xx  ... xx       0
> 40    Fastball        5            2            xx  ... xx       0
> 40    Fastball        5            3            xx  ... xx       1
> 60
> 40    Fastball        5            4            xx  ... xx       0
> 40    Fastball        5            5            xx  ... xx       0
>
>
>
>
>
> --
> Gregory E. Gilbert, EdD, MSPH, PStat®
> ASA Accredited Professional Statistician™
>
>        [[alternative HTML version deleted]]
>
>
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