# [ncl-talk] Fw: Taylor diagram

Serena Illig serena.illig at gmail.com
Wed Feb 13 01:56:46 MST 2019

```Dear Ehsan,

The answer is ratio need to be the ratio of standard deviation (STD).
Reading the Taylor (2001) article, you will see that the ratio that has to
be computed is the ratio of standard deviation. So the labels are corrects.
Looking at https://www.ncl.ucar.edu/Applications/taylor.shtml and in
particular at taylor_2.ncl example, you will see that second point of "p"
data set has a ratio of 0.5 which is represented by the blue point labeled
2 in the diagram that has a distance from the origin of 0.5. Thus no
root_square is applied to ratio before drawing the point in the diagram.
So ratio has to be the ratio of STD, and the comment in taylor_3.ncl is
erroneous.

Have a nice day,

Serena

.¸. , . .·´¯`·
><(((º>     `·.¸.·´¯`·...¸><(((º>¸.¸. , . .·´¯`· ><(((º> .
`·.¸.·´¯`·...¸><(((º>                                                  .

.
Serena ILLIG-THEVENIN       LEGOS/IRD       .
.
University of Cape Town - UCT          .
Department of Oceanography           .
Private Bag X3, Rondebosch  7701   .
SOUTH AFRICA                                  .

.
E-mail     : *serena.illig at ird.fr <serena.illig at ird.fr> *
.
Web-site : http://sillig.free.fr                             .
Fax         : +27 21 650 3979                          .
.
<º)))><..·´

On Tue, Feb 12, 2019 at 7:10 PM Ehsan Taghizadeh <ehsantaghizadeh at yahoo.com>
wrote:

> Hi,
> May I ask about "_ratio" in "taylor_3.ncl" (
> https://www.ncl.ucar.edu/Applications/taylor.shtml), which is ratio of
> "standard deviations" or "variances". Because in that has been written
> "_ratio are the ratio: Case_Variance/Reference_Variance"! However the label
> of axes are "Standard Deviations (Normalized)"!
> I'll be thankful if I have any help.
>
> Sincerely
>
> ----- Forwarded Message -----
> *From:* Ehsan Taghizadeh <ehsantaghizadeh at yahoo.com>
> *To:* Ncl-talk <ncl-talk at ucar.edu>
> *Sent:* Friday, February 8, 2019, 4:40:35 PM GMT+3:30
> *Subject:* Taylor diagram
>
> Hi,
> First of all I really sorry hearing about the destiny of NCL. I have had
> many helps from ncl-talk to write several scripts for my PhD thesis and
> also for my job. However I hope the best for NCL team.
>
> Second I have a problem again to draw a plot and I'll be thankful if I
> could have any help.
> I want to plot taylor diagram and for that I saw these links:
> http://www.ncl.ucar.edu/Document/Functions/Contributed/taylor_stats.shtml
> and
> https://www.ncl.ucar.edu/Applications/taylor.shtml
> Based on them I've plot the attached one (taylor.png). However I want to
> have RMSE too (something like Figure 1 in Taylor Diagram Primer
> (Taylor_2005.png)). May be taylor_stats could help for this, but I'm not
> sure. Could I know how to add RMSE to this plot. However it doesn't matter
> to be normalized taylor diagram or not.
> My data and scripts are also attached, if needed.
>
> Sincerely
> Ehsan
> _______________________________________________
> ncl-talk mailing list
> ncl-talk at ucar.edu
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20190213/79bd9b63/attachment.html>
```