# Tagged Questions

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### what are the units of the wavelet scale- a

What are the units of the wavelet scale- a ? I always thought that it would be non-dimentional due to mathworks wavelet help: (copy/paste) "If we accept to associate the frequency Fc to the wavelet ...
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### Finding similarities using Wavelet transform

I have a time serie and I want to find similarities in it. For the first step I have calculated Haar-wavelet coefficients for this time serie, and now I don't know exactly how should I continue ...
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### unbalanced haar wavelets

My aim is denoising of the smooth functions based on second generationwavelets.In (unbalanced haar technique for nonparametric function estimation) signal are denoised using unbalanced haar wavelets. ...
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### Detrending & cross-correlation function

I am looking for some help with my time-series data. What is the best method of detrending/transformation of these two variables, so I do not violate assumptions of stationarity when applying a cross ...
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### Time series forecasting and wavelet transform

In article1 and article2 the authors proposed a method for forecasting electricity prices by using a wavelet transform. They decompose the original price P to 4 in ...
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### bounds of wavelet coefficients of function

Let $A_k^p:=\{f:\, \|(ix)^k\hat{f}(x)\|_p\leq 1\}, k \in Z_+, p \in (1, \infty)$. I am wondering what the application of the lower and upper bounds of wavelet coefficients of the function on the ...
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### Classification of signals, and Wavelet Transform based denoising

Stationary Wavelet Transform based denoising methods are considered the best because of their translational invariance. On the other hand, Matlab promises SWT based denoising but in the ddencmp ...
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### difference between package ‘waveslim’ and 'wavethres' in R

Both are still active projects for wavelet decomposition. Based on your experience, is there a difference in approach? Things that one can do but not the other one? Thanks
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### Any basic Wavelet kernel implementation for SVM?

I have looked at at the toolbox by Alain from here http://asi.insa-rouen.fr/enseignants/~arakoto/toolbox/index.html but it comes with bad documentation. Does anyone have experience here implementing a ...
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### Wavelets and machine learning

I am trying to learn features from a signal using Wavelet transform and then apply ML techniques on it to classify a signal. The problem I am facing is that, at each of level of decomposition, my ...
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### Unbalanced Haar Wavelets and R package unbalhaar

I have found the article by Fryzlewicz (2007) and his R package unbalhaar. I do not understand well the outputs of his functions and in particular of the ...
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### Clustering time series with wavelets in R

Can discrete wavelet trasform be used for feature extraction from time series in order to cluster them? Any R code how to do this will be appreciated.
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### Finding the instantaneous period of a signal (or calculating period degradation)

I have a signal, of varying amplitude, and after a certain point in time, I expect to see the period of this signal lengthen. I am looking for a way to measure the lengthening of this period. Is this ...
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### Wavelet smoothing at different scales

I would like to perform wavelet smoothing at different scales in R. I got the idea from this figure (panel A) were they measure the density/intensity of a particular signal at different scales. Here ...
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### Compressing data using wavelets with R

I'm trying to compress data using wavelets and I wanted to do it with R. Could anyone tell me if there is such a tool? Thanks in advance.
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### Frequency range of wavelet packets decomposition at each level

I measured turbulent velocity in 1Hz sampling rate. To remove fluctuations with T>900 sec I decompose the time series by wavelet packets, problem is that I don't know which levels should be kept and ...
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### Frequency of a wavelet filter

Assume that I have decomposed a data set using Symlet Wavelet with six levels. How can I estimate the approximate frequency interval of each level? That would be great if you consider your answer in ...
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### Wavelet auto correlation

I have a time serie that I want to analyse through a wavelet decomposition. I am using the R package WaveThres. I am interested in the wavelet autocorrelation, but I struggle to understand what ...