[R] date and time functions

Dear R community I would like to perform some statistical analysis on a data set containing the following items: date, time, index of observation and various covariates. The date and time are originally extracted in the following format: dd.mm. and hh:mm:ss respectively. R and more

[R] post-hoc test with kruskal.test()

Dear R users, I would like to know if there is a way in R to execute a post-hoc test (factor levels comparison, like Tukey for ANOVA) of a non-parametric analysis of variance with kruskal.test() function. I am comparing three different groups. The preliminary analysis using the

[R] Integrating a function

Hello everybody! I have problems with integrating my function. My primary function is a “survival function” of the following type: surviv - exp(-k*x)/(1+exp(alpha*(x-tau))) I would like to integrate this function over a defined range and obtain a vector with all the values from