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Dear R-Helpers, I need to compute cross-correlation on two signals wich may contain missing values. One cannot pass "Na.action=na.pass" to the ccf() function. So, I wrote a naive function of my own (see below). Unsurprisingly, this function is not very fast. Do you think that it is possible to do better, or should I accept my fate ? Bruno. my_ccf <- function (X, Y,

Dear R-Users, I have a question concerning the determination of breakpoints and comparison of slopes from broken-line regression models. Although this is rather a standard problem in data analysis, all information I gathered so far, did not answer my questions. I added a subsetted example of my data. Basically it is a timeseries of recorded phenotypes in three different groups of plants. You