RDX2 X  errorsINx source >function(mu = 8.25, n = 100, a = 5, b = 2.5, SDx=1, sigma = 2,  timesSDx=(1:5)/2.5){ 5 mat <- matrix(0, nrow=n, ncol=length(timesSDx)+2)  * x0 <- mu*exp(rnorm(n,0,SDx/mu))/exp(0)  " y <- a + b*x0+rnorm(n,0,sigma) " mat[, length(timesSDx)+2] <- y  mat[,2] <- x0  mat[,1] <- y  sx <- sd(x0) k <- 2  for(i in timesSDx){  k <- k+1 ( xWITHerror <- x0+rnorm(n, 0, sx*i)  mat[, k] <- xWITHerror  }  df <- as.data.frame(mat) 8 names(df) <- c("y", "x", paste("x",timesSDx,sep=""))  df  }þý mu@ € n@Y$ a@$ b@ SDx?ð sigma@$ timesSDx / ( :?ð@þþ@þþ { <- mat matrix nrowÿ ncol + length ÿþ@þþþÿ x0 ÿ *ÿ exp rnormÿ ÿÿÿþþþþÿþþþÿ yÿÿÿÿÿÿþþÿÿÿþþþÿ [ÿûÿÿ ÿþ@þþÿþÿÿÿû@þÿþÿÿÿû?ðþÿþÿ sx sdÿþþÿ k@þ for i ÿ ÿÿÿÿÿ?ðþþÿ xWITHerrorÿÿÿÿÿÿÿþþþþÿÿÿûÿþ ÿþþþÿ df as.data.frameÿþþÿ names!ÿþ c y x paste x ÿ sep þþþ!ÿþþ