Question regarding executing auto-correlation

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chean hau
chean hau 2014-2-3
评论： chean hau 2014-2-6
Hi all,
I have to stationarized my data using auto-correlation to be used in arima models. However, i have trouble getting the codes correct.
data = xlsread('20jun.xlsx');
pv = data; %144 readingfrom 20jun
t= [1:144]; %defined time points
plot(t,pv);
I have 144 data readings, resulting in 144 time point. Any advise will be appreciated. Thanks for the time.
  2 个评论
chean hau
chean hau 2014-2-4
编辑：chean hau 2014-2-4
Hi Mischa,
Thanks for taking the time to reply. The error i obtained is 'Vectors must be the same lengths'. Pardon my raw knowledge regarding matlab, but is it necessary to use an arima model to do acf? Thanks in advance.

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Image Analyst
Image Analyst 2014-2-4
编辑：Image Analyst 2014-2-4
Before plot, put there lines and tell us what it says
size(t) % Don't use a semicolon
size(pv) % Don't use a semicolon
class(t) % Don't use a semicolon
class(pv) % Don't use a semicolon
And I don't see any autocorrelation going on, just reading data from a workbook and plotting it.
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显示 3更早的评论
Image Analyst
Image Analyst 2014-2-5
I don't know. I don't have your data. Can't you tell if it works or not? Do you get the expected results?
chean hau
chean hau 2014-2-6
Hi Image analyst,
I think it works. Thank you so much for your advises. You have been a great help.

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