[R] how to shift a chron timestamp by 6:30 hours

1 07:30:00) (22/11/11 04:00:00) Now I want to shift the timestamp by 06:30 (hh:mm) backwards, to get [1] (12/02/11 01:30:00) (21/11/11 21:30:00) How can I achieve this? Are there any more detailed examples on manipulation of chron objects? I have some trouble with this. Thanks in advance, Macie

Re: [R] Is there a non-parametric repeated-measures Anova in R ?

I always wonder why no one of the real experts posts a reference to E. Brunners work: Brunner, E., Domhof S. and Langer, F. (2002). Nonparametric Analysis of Longitudinal Data in Factorial Designs. Wiley, New York. The german book is great: Brunner, E. und Langer, F. (1999). Nichtparametrisch