[gradsusr] P-value of scorr & tcorr

[James Ciarlo`]

Hi Teresa,

sorry for replying so late, i had some personal issues. well I have some
difficulties with this technique since I have statistically significant
values both negative and positive, so when i do set cmin or cmax, it will
block out the others. Is there a way to set it to absolute values?

With regards to scorr, I am of the understanding that grads correlates the
final spatial distribution of both and thus producing one value. I guess for
statistical significance one can use the values on statistics books, and
also consider the resolution of the image to obtain n

Regards,

James

On 20 May 2011 17:41, <tcavazos at cicese.mx> wrote:

> Hi,
>
> A simple way for tcorr: look at the statistically significant values for
> correlation in a statistics book; then according to your n-1 observations
> get the threshold values for the level of interest (p<0.05 or p<0.01).
>
> In grads you you can black out the values lower than those thresholds to
> display only the significant ones. Also you can set a minimum value to
> plot. For example, if your significant correlation at the 95% level is
> 0.45:
>
> "set cmin 0.45"
>
> By the way how do you calculate the scorr, do you only average the spatial
> window after calculating the tcorr?
>
> The spatial significance is much more complicated...I am also interested
> in that, if anyone has it. It may require a bootstrap...
>
> Tereza Cavazos
>
>
> > Dear gradsusrs,
> >
> > I have a question about scorr and tcorr functions. Is there a way to
> > obtain
> > the p-value in this cases? i.e. one value for scorr and map value for
> > tcorr
> >
> > Or anything of the sort?
> >
> > Regards,
> >
> > James
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>
>
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