(no subject)

Hello, I have a data with two variables nodes and index, I want to extract
3 months seasons, with a shift of 1 month, that is, DJF, JFM, FMA etc to
OND. Was wondering how to go about it. Kindly find data sample below, data
is in csv format.
Any help will be appreciated.

My data sample;

      era...1.    Node_freq           MEI
1   1980-01-01 -0.389855332  0.3394196488
2   1980-02-01 -0.728019153  0.2483738232
3   1980-03-01 -1.992457784  0.3516954904
4   1980-04-01  0.222760284  0.5736836269
5   1980-05-01  0.972601798  0.6289249144
6   1980-06-01  0.570725954  0.5736836269
7   1980-07-01 -0.977966324  0.4120517119
8   1980-08-01  0.056128836 -0.0104418383
9   1980-09-01  0.987304573 -0.0687520861
10  1980-10-01  1.188242495 -0.1403611624
11  1980-11-01  1.693037763 -0.0963727298
12  1980-12-01  1.173539720 -0.2539126977
13  1981-01-01  0.423698206 -0.6140040528
14  1981-02-01 -2.208098481 -0.5209122536
15  1981-03-01 -0.786830252  0.1133395650
16  1981-04-01 -0.110502611  0.3302127675
17  1981-05-01 -1.272021820 -0.1894645290
18  1981-06-01  0.394292656 -0.3736021538
19  1981-07-01  1.452892441 -0.4032687711
20  1981-08-01  0.698150002 -0.4441882433
21  1981-09-01  0.997106423 -0.1720737534
22  1981-10-01  0.247264908 -0.2436828296
23  1981-11-01  0.771663876 -0.3909929295
24  1981-12-01 -0.316341458 -0.4943145967

Regards,
?Kwesi?

Try not to become a man of success but rather a man of value-Albert Einstein

University of Cape Coast|College of Agriculture and Natural Sciences|Department
of Physics|
Team Leader|Recycle Up! Ghana|Technology Without Borders|
Other emails: kwesi.quagraine at ucc.edu.gh|kwesi.quagraine at teog.de|
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Skype: quagraine_cwasi
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