psctrans
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— | psctrans [2010/07/06 05:00] (current) – created jochen | ||
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+ | ====== psctrans ====== | ||
+ | ===== Motivation ===== | ||
+ | As an alternative to [[ztrans|z-transformation]] of data, applying the per cent signal change (PSC) transformation has two advantages: the signal amplitude is not altered based on variance, which means that data containing additional noise will not undergo additional scaling (unless the noise has a strong bias on the mean, that is). Additionally, | ||
+ | |||
+ | ===== Function reference ('help psctrans' | ||
+ | < | ||
+ | |||
+ | FORMAT: | ||
+ | |||
+ | Input fields: | ||
+ | |||
+ | tc time course data | ||
+ | dim | ||
+ | tp time points (indices of dim to use for normalization) | ||
+ | |||
+ | Output fields: | ||
+ | |||
+ | psctc PSC transformed time course | ||
+ | pscf PSC transformation factor | ||
+ | |||
+ | See also ztrans</ | ||
+ | |||
+ | ===== Formula ===== | ||
+ | The new values are computes as '' | ||
+ | |||
+ | ===== Usage examples ===== | ||
+ | * applying PSC transformation on a single time-course: | ||
+ | * PSC transformation of an entire VTC dataset: <code matlab psctrans_vtc.m> | ||
+ | |||
+ | For further examples, also check out the [[ztrans]] documentation; |
psctrans.txt · Last modified: 2010/07/06 05:00 by jochen