Hello,
Please take a look at the ttest documentation on the ncl website:
http://www.ncl.ucar.edu/Document/Functions/Built-in/ttest.shtml
s1,s2 are scalars containing the number of statistically independent
observations.
There are numerous examples that show how to use the function located at
the bottom of the page.
Best regards,
Adam
Sabeerali(sebi) wrote:
> Hello support,
>
> I want to do the ttest for composite..when I searched in the NCL
> tutorial I found the argument needed for ttest is ave1,ave2,
> var1,var2,s1,s2, iflag,tval_opt
> How I can find the arguments s1 and s2. What is mean by this?
> The dimension of the ave1,ave2,var1,var2 are nlatXnlon..
>
> Any help would be appreciable
>
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
> begin
> ;**************************************************************
> in2=addfile("mn_olr_1983-05.nc <http://mn_olr_1983-05.nc>","r")
> olr=in2->olr
> olrflt=short2flt(olr)
> mn_clim_olr=clmMonTLL(olrflt)
> ;printVarSummary(mn_clim_olr)
> Mon_olr_anom=calcMonAnomTLL(olrflt,mn_clim_olr)
> Mon_olr_anom@_FillValue=32767
> Mon_olr_anom_at_missing_value=32767
>
> ;**********************************************************************
> ; significant test
> ;*********************************************************************
> four_month_runavg=runave_Wrap(Mon_olr_anom(lat|:,lon|:,time|:),4,0)
> JJAS_olr_anom_1983_05=four_month_runavg(:,:,6::12)
>
> JJAS_olr_anom_4yrs =
> (/JJAS_olr_anom_1983_05(:,:,0),JJAS_olr_anom_1983_05(:,:,7),JJAS_olr_anom_1983_05(:,:,16),JJAS_olr_anom_1983_05(:,:,21)/)
>
> ave1=dim_avg_n(JJAS_olr_anom_4yrs,0)
> var1=dim_variance_n(JJAS_olr_anom_4yrs,0)
> ave2=dim_avg_Wrap(JJAS_olr_anom_1983_05)
> var2=dim_variance_Wrap(JJAS_olr_anom_1983_05)
>
> end
>
>
> ------------------------------------------------------------------------
>
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-- -------------------------------------------------------------- Adam Phillips asphilli_at_ucar.edu National Center for Atmospheric Research tel: (303) 497-1726 ESSL/CGD/CAS fax: (303) 497-1333 P.O. Box 3000 Boulder, CO 80307-3000 http://www.cgd.ucar.edu/cas/asphilli _______________________________________________ ncl-talk mailing list List instructions, subscriber options, unsubscribe: http://mailman.ucar.edu/mailman/listinfo/ncl-talkReceived on Wed Sep 02 2009 - 09:35:17 MDT
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