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...s", in the point 6.3 say that exist a set of validation test, that are localized in the test subdirectory. I search the place in the page www.r-project.org and not found this, can you say me where is the set?. I work in a pharmaceutical laboratory and i need to validate the software for use in analitical methodology validation; If you can guide me and give more information of the subject, i stay very grateful Atte: Daniel Andr?s Ponce Rosales Pharmaceutical Chemist Instituto Bioqu?mico beta Santiago de Chile

Dear R experts. 'D()' function recognizes some of the analitical functions, such as sin, cos, etc. But I'd like to take analytical derivatives from asin, atan etc. functions. Are there any R packages providing that features? Thanks. -- Timur.

Hi there, we are beginners in R and we are trying to fit the following time series using ar(2): > x <- c(1.89, 2.46, 3.23, 3.95, 4.56, 5.07, 5.62, 6.16, 6.26, 6.56, 6.98, > 7.36, 7.53, 7.84, 8.09) The reason of choosing the present time series is that the we have previously calculated analitically the autoregressive coefficients using the direct inversion method as 1.1, 0.765, 0.1173. Since those coefficients fits well our time series, we wanted to learn how to do it in R and check that it would give us the same autoregressive coefficients as the direct inversion method. So as first s...