sdist
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— | sdist [2010/06/10 23:54] (current) – created jochen | ||
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+ | ====== sdist - statistical distribution functions ====== | ||
+ | ===== Motivation ===== | ||
+ | For many tasks in statistical hypothesis testing, it is necessary to find the ordinate value where the cumulative distibution function reaches a particular value (inverse of the CDF). These functions are available in Matlab' | ||
+ | |||
+ | ===== Function reference ('help sdist' | ||
+ | < | ||
+ | |||
+ | FORMAT: | ||
+ | |||
+ | Input fields: | ||
+ | |||
+ | type either of ' | ||
+ | ' | ||
+ | variate | ||
+ | df1, df2 d.f. (or other required parameter) | ||
+ | pin | ||
+ | |||
+ | Output fields: | ||
+ | |||
+ | d | ||
+ | </ | ||
+ | |||
+ | ===== Usage examples ===== | ||
+ | * find the value required to threshold a t-map with 25 degrees of freedom at p<0.005 (uncorr.):< | ||
+ | * find the value required to threshold an F-map with (3, 20) degrees of freedom at p<0.01 (uncorr.):< | ||
+ | * find out if a given t-statistic (3.314, df = 115) is enough to meet a specific alpha criterion (0.001):< |
sdist.txt · Last modified: 2010/06/10 23:54 by jochen