When x -> infinity, e^x -> infinity, but in contrast e^ix is always bounded to the unit circle according to Euler's formula. This clever trick is said to be an important step that finally led to the discovery of Fourier series.
Tuesday, January 30, 2007
Saturday, January 27, 2007
Rank Correlation Coefficients
To measure the correlation between two rankings rather than two random variables, we can consider using the following non-parametric correlation coefficients.
Spearman's ρ
Kendall's τ
Hellinger metric
Hellinger metric is the square-root of Jensen–Shannon divergence, a symmetric version of Kullback-Leibler divergence. It looks a good choice when measuring the dissimilarity between two distributions (e.g., two multinomial distributions corresponding to a pair of documents), because it is known to be a legitimate distance metric.
Wednesday, December 27, 2006
How to Copy IE7 Search Providers List
I have found the following convenient yet safe way to copy IE7 search providers list from one computer A to another computer B.
(1) On computer A, add all desired search providers to IE7.
(2) On computer A, use regedit to find and export the following key to a .reg file: HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchScopes.
(3) Copy that .reg file from computer A to computer B.
(4) On computer B, run (double-click) that .reg file to import the corresponding registry key.
References
[1] Add Search Providers to Internet Explorer 7
[2] How to create custom .adm or .admx files to add search providers to the toolbar search box in Internet Explorer 7
Subscribe to:
Posts (Atom)
Posts
