Good morning! I have 4 questions which trouble me:
1. I want to test the hypothesis that the 2 proportions (the mean of a binomial) which come from 2 different samples are equal. I want to use the following function z= (p1-p2)/ sqrt((p1(1-p1)/n1)+(p2(1-p2)/n2)) which is one of the standard formulas for this case. Is there such a function in R? p1=the proportion from the first sample n1=the first sample size p1=the proportion from the second sample n2=the second sample size 2. How can i find the median of a variable in survey package? a<-c(1:10) b<-sample(1:20, 10, replace=T) b1<-sample(0:1, 10, replace=T) c<-data.frame(a,b, b1) library(survey) design<-svydesign(id=~1, data=c) svymean(~b, design) svymean gives me the mean, but what function gives me the svymedian, and what function gives me the svyproportion for b1? I want to know the median for a metric variable and the proportion for a binomial variable ? 3. Could time series analysis (arima/arma) be applied on data that are obtained from a sample?. Eg: Say I have data from the same sample in 40 moments. Could I use arima/arma on the series? Or must i have data for the whole population like data from the Statistical Office on investment, inflation, demographics and so on? 4. I want to modify the scale of my axes within a plot but i really could not find this option. I think there is such an option, but i can not find it. x<-rnorm(100, 100, 3) x<-ts(x, frequency=12) acf(x) plot(x) On the above example, i want to a scale like this 95,96,97,98,....104,105 (on y) and 1,2,3,4,...7,8 (on x). Thank you very much and have a great day! --------------------------------- [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.