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sir, how to i find confidence intervals for filtered data?

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kopparthi
kopparthi 2014-4-7
评论： kopparthi 2014-4-7
sir i have a time series of temperature with varying time, i coverted this data into frequency domain by apply LPF & FFT,at last i got graph i.e., amplitude vs Frequency...now i need to find confidence levels for this data...please help me? i attached the data file...
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kopparthi
kopparthi 2014-4-7
amp=untitled(:,2);
>> f=untitled(:,1);
>> plot(f,amp)
choose scale 0 to 1 for x-axis,0 to 0.8 for y-axis .,such that you will find the peaks for the data.

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