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...i have many variables for in example 4weeks and want to do aggregations, like mean standard , deviation etc.. With mean it works but how i can calculate the standard deviation for the 4weeks and for every ID. many thanks & regards, christian week1 <- grep("(_PRO_001)",names(dmx3),perl=T) week1table <- subset(dmx3,select=c(ID,week1)) week2 <- grep("(_PRO_002)",names(dmx3),perl=T) week2table <- subset(dmx3,select=c(ID,week2)) week3 <- grep("(_PRO_003)",names(dmx3),perl=T) week3table <- subset(dmx3,select=c(ID,week3)) week4 <- grep(&qu...

Dear all, we''re currently looking forward to restructure our hardware environment for our datawarehousing product/suite/solution/whatever. We''re currently running the database side on various SF V440''s attached via dual FC to our SAN backend (EMC DMX3) with UFS. The storage system is (obviously in a SAN) shared between many systems. Performance is mediocre in terms of raw throughput at 70-150MB/sec. (lengthy, sequential reads due to full table scan operations on the db side) and excellent is terms of I/O and service times (averaging at 1,7...