Thread: stacking and standard deviation

Started: 2012-12-14 16:56:42
Last activity: 2012-12-14 16:56:42
Topics: SAC Help
marco.olivieri@bo.ingv.it
2012-12-14 16:56:42
Dear All,

SSS provides a useful tool for stacking a set of records. For my
purposes the error associate to the resulting stack counts. How can I
evaluate the rms or variance associated to each sample of the
resulting time-series?


Computation is rather simple. Did anybody ever thought to include it
in SSS in order to have the possibility to
plot, and save, the stack plus the stack +/- sigma?

thanks
Marco


  • George Helffrich
    2012-12-14 16:23:16
    Dear All -

    MacSAC implements all these features in its version of the SUMSTACK command. The command syntax is

    SUMSSTACK [NORMALIZATION {ON|OFF}] [UNCERTAINTY {ON|OFF}]
    [TYPE {LINEAR|PHASEWEIGHT [<n>]|NTHROOT [<n>]}]

    which also allows for different types of stacking. You also have the ability to include or exclude particular traces from the stack (via a CHANGESTACK option).

    On 14 Dec 2012, at 07:56, marco.olivieri<at>bo.ingv.it wrote:

    Dear All,

    SSS provides a useful tool for stacking a set of records. For my purposes the error associate to the resulting stack counts. How can I evaluate the rms or variance associated to each sample of the resulting time-series?


    Computation is rather simple. Did anybody ever thought to include it in SSS in order to have the possibility to
    plot, and save, the stack plus the stack +/- sigma?

    thanks
    Marco

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    George Helffrich
    george.helffrich<at>bris.ac.uk



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