Re: [ferret_users] Plotting 95% confidence intervals

[Steve Hankin <steven.c.hankin@xxxxxxxx>]

Hi Sarah,

If you have a variable that contains the statistical confidence values, 
then the result is easy:

   LET var95 = IF confidence GE 0.95 THEN my_var

The values in var95 will be masked to include only those where you have 
95% confidence.  Others will be set to "missing" and become invisible.

I am not aware of a student t-test function in Ferret, but it is the 
sort of calculation that can be readily put into an external function 
(and thereafter made sharable for other Ferret users).

   - Steve

=======================================

Sarah Bonham wrote:
> Dear Ferret users,
>
> I have 2 sets of temperature data, both on a 73x96 array and I am 
> trying to produce a map of the difference between the two showing only 
> temperature values that have a 95% confidence.
>
> Is there a function in ferret to apply a student t-test or something 
> similar?
>
> Ideally, I would just like to map the temperatures that have 95% 
> confidence, but if this isn't possible and there is a way to put 
> shading over the top instead, then this would be great to.
>
> Any help is greatly appreciated,
>
> thank you in advance,
>
> Sarah