Numerical summary of data
Covariance and Correlation
Numerical Summary of Data
Pan Chao
November 17, 2014
Numerical summary of data
Covariance and Correlation
Measures of center
Measures of Center
1. Mean: arithmetic average
x1 + x2 + . . . + xn
1∑
=
xi
n
n
n
x
¯=
i=1
Example:
1, 2, 2, 3, 4, 7, 9
x
¯=
1+2+2+3+4+7+9
= 4.
7
Numerical summary of data
Covariance and Correlation
Measures of center
2. Mode: most frequent value in a data set, highest peak.
Example: 2 is the mode in the…
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