January 2008
Intermediate to advanced
572 pages
12h 49m
English
book
Discrete Wavelet Transformations: An Elementary Approach with Applications
by Patrick J. Van Fleet
Content preview from Discrete Wavelet Transformations: An Elementary Approach with Applications
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APPENDIX A
BASIC STATISTICS
The material in Chapter 9 makes use of several ideas from basic statistics. We also use some simple descriptive statistics in the edge detection application in Section 6.4. In this appendix we review some basic statistical concepts.
A.1 DESCRIPTIVE STATISTICS
In Chapter 6 we make use of some basic descriptive statistics. We utilize the mean absolute deviation in Chapter 9. We start first with the definition of the mean.
Definition A.1 (Mean). Let x = (x1, x2, … , xn) be a list of numbers. Then the mean 
is defined as
A second statistic that is used to measure the center of the data is the median. The median is a number xmed such that the number of data below xmed is equal to the number of data above xmed.
Definition A.2 (Median). Let x = (x1, x2, … , xn) be a list of numbers. The median xmed is constructed by first sorting the values x1, x2, … , xn from smallest to largest. Call this new list y = (y1, y2, … , yn). If n is odd, we set 
. If n is even, we take the median to be the average of the two middle components. That is, xmed = (yn/2 + yn/2+l). ...
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