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What is a scalogram?

What is a scalogram? Here are some definitions.

Noun
  1. (signal processing) A visual representation of a wavelet transform, having axes for time, scale, and coefficient value, analogous to a spectrogram.
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Examples
This conclusion is reinforced using the scalogram information.
The square modulus of the CWT is called the scalogram.
The scalogram can reach the maximum at certain scale to obtain the relation between the scale and its equivalent Fourier frequency.
Schulze used Guttman's scalogram analysis to select 10 items from the Rokeach's Dogmatism scale which best met the criteria of unidimensionality.
All of these would influence scalogram analysis seriously.
The scalogram is a plot of the sum of the squares of the coefficients at each scale.

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