# Re: [ferret_users] trend of SST

Hi Nitin,
I could not understand why you multiply with 112, what it does is to fit a straight line and give you the slope of the straight line as far as I understand. So slope will give the average trend of the variable over  the period selected. If time axis unit is day it will be degree Celsius/day .

With best regards,
Sudheer

with best regards

Sudheer

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Dr. Sudheer Joseph
Scientist,
INCOIS, MoES, Govt. of India.
"OCEAN VALLEY" , Pragathi Nagar (BO), Nizampet SO,  Telangana, India. PIN- 500 090.
Tel:+91-9440832534(Mobile) Tel:+91-40-23886047(O),Fax:+91-40-23892910(O)
E-mail: sjo.India@xxxxxxxxxsjo@xxxxxxxxxxxxx.
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"The ultimate measure of a man is not where he stands in moments of
comfort and convenience, but where he stands at times of challenge and controversy."
Martin Luther King, Jr.
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On Mon, Sep 7, 2015 at 11:26 AM, Nitin Patil wrote:
Dear Sudheer/Ferret usrs,

I tried as suggested (attached script), But I want to confirm whether I am doing correct?
My data is JJAS mean per year over 112 years (Time steps 112 in .nc file with units: deg Celsius for SST).

In script, I multiplied slope by 112 to get unit Deg Cel/112 years, Am I wright?

Let me know, Thanks in advance!!

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Regards,
Nitin Patil

On Mon, Sep 7, 2015 at 5:33 AM, Sudheer Joseph wrote:
Hi Nitin,
You may use regresst function which regress your variables change over time against time axis, basically you are looking for slope which is one of the outputs of regresst function

Sudheer

On Saturday, September 5, 2015, Nitin Patil <nitinpatil85@xxxxxxxxx> wrote:
Dear Ferret users,

I am using HadISST dataset for SST. I have to plot trend of SST (for 30 years). Did anyone knows how to plot in ferret? It will be great help!

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Regards,
Nitin Patil

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