search for: ctst

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2007 Apr 25
1
for loops
Hello everybody I'm very new at using R so probably this is a very stupid question. I have a matrix of "p" columns and I have to calculate for each of them the "two sample t-statistic" and p-value and to save the results into two different vectors. I have divided my matrix into two submatrices: submatrix A containing the first "n1" rows (p columns) and submatrix B
2008 Mar 07
0
How to do a time-stratified case-crossover analysis for air pollution data?
...;-which(air$stratn==lest[i]) for (j in 1:length(a)) { air$nctrl[a[j]]<-sum(air$mi[a[-j]]) } } #create cases and controls cami<-rep(1,sum(mi)) ctmi<-rep(0,sum(air$nctrl)) capm<-rep(pm10, mi) ctpm<-rep(pm10, air$nctrl) cast<-rep(air$stratn, mi) ctst<-rep(air$stratn, air$nctrl) cady<-rep(dates, mi) ctdy<-rep(dates, air$nctrl) cases<-c(cami, ctmi) stranu<-c(cast, ctst) days<-c(cady, ctdy) pmva<-c(capm, ctpm) air2<-data.frame(cases, days, pmva,stranu) air.cl<-clogit(cases~pmva + strata(stranu), method=&...
2008 Mar 07
0
How to do a time-stratified case-crossover analysis for air pollution data? Unformatted text-version, with an additional note
...gth(lest)) { ?? a<-which(air$stratn==lest[i]) ?? for (j in 1:length(a)) ?? { ????? air$nctrl[a[j]]<-sum(air$mi[a[-j]]) ?? } } #create cases and controls cami<-rep(1,sum(mi)) ctmi<-rep(0,sum(air$nctrl)) capm<-rep(pm10, mi) ctpm<-rep(pm10, air$nctrl) cast<-rep(air$stratn, mi) ctst<-rep(air$stratn, air$nctrl) cady<-rep(dates, mi) ctdy<-rep(dates, air$nctrl) cases<-c(cami, ctmi) stranu<-c(cast, ctst) days<-c(cady, ctdy) pmva<-c(capm, ctpm) air2<-data.frame(cases, days, pmva,stranu) air.cl<-clogit(cases~pmva + strata(stranu), method="approxima...