search for: week1

Hi, 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(d...

...7 6/12/2007 3 8 6/13/2007 3 9 6/13/2007 3 10 6/18/2007 4 11 6/18/2007 4 12 6/25/2007 5 13 6/28/2007 5 Basically, I would like to collapse the daily data into weekly sums such that the result should look like the following: Date Amount 1 2007/6/Week1 2 2 2007/6/Week2 4 3 2007/6/Week3 15 4 2007/6/Week4 8 5 2007/6/Week5 10 Does there already exist a function that aggregates the data at user-defined time frequency? Any pointers would be greatly appreciated. Jacques > version _ platform i...

...have some breaks because of missing data***). Something like this: Date Var1 Var2 12/01/2004 7 0 12/01/2004 0 0 12/01/2004 0 7 12/01/2004 7 0 12/01/2004 0 7 12/01/2004 0 7 12/02/2004 0 0 ... I need to find out weekly average of var1 and var2, so that I end up with data like: Week Year Var1 Var2 week1 2004 2 3 week2 2004 4 2 ... week52 2004 4 4 week1 2005 2 3 ... Can anyone help please, any help would be greatly appreciated. Thanks! [[alternative HTML version deleted]]

...like to make sure I am not doing something wrong. I am running an OLS regression. I have several subgroups in the data set (locations) - and in each location I have weekly data for 2 years - on my DV and on all predictors. Looks like this: location week DV Predictor1 Predictor 2 location1 week1 xxx xxxxxxx xxxxxxxxx location1 week2 xxx xxxxxxx xxxxxxxxx . . . location2 week1 xxx xxxxxxx xxxxxxxxx location2 week2 xxx xxxxxxx xxxxxxxxx My DV variable was mean-centered - for each location and I am using this mean-centered DV as the DV in lm. Also, I am using the mean...

Hi all: I've done this before with factors but can't figure how to do it with a continuous variable. I am trying to reorder the sequence of my weeks along the X axis. I want to start with week 27 to 52 and then 1 to 26. I guess I could use levels along with seq() but doesn't seem to work for me. Thanks for your help winter <- structure(list(week = c(27L, 28L, 29L, 30L, 31L, 32L,

HI Fares, You could try this: dat1<- read.table(text=" date????? donation 3jan2003?? 20235 4jan2003?? 25655 5jan2003?? 225860 6jan2003?? 289658 7jan2003?? 243889 8jan2003?? 244338 9jan2003?? 243889 ",sep="",header=TRUE,stringsAsFactors=FALSE) The post is not very specific as to what you need.? I hope this works for you. library(xts)