On 27/10/2020 3:06 p.m., varin sacha via R-help wrote:
Dear R-experts,
Here below my R code. The warning message is not a problem to me but there is
an error message more problematic. I understand the error message but I don't
know if it is possible to correct the error and if yes, how to correct it.
Many thanks.
n <- 60
b <- runif(n, 0, 5)
a <- runif(n, 0, 5)
z <- rnorm(n*0.95,2,3) + rnorm(n*0.05,2,9)
y_model <- 0.1 * b - 0.5 * z - a + 10
y_obs <- y_model +c( rnorm(n*0.95, 0, 0.1), rnorm(n*0.05, 0, 0.5) )
df<-data.frame(b,a,z,y_obs)
I suspect you intended to concatenate the two parts of z, i.e.
z <- c(rnorm(n*0.95,2,3), rnorm(n*0.05,2,9))
You shouldn't ignore the warning.
By the way, it's not true for every n that my expression for z will
always give something of length n. It would be safer to do the
calculation as
m <- round(n*0.95)
z <- c(rnorm(m,2,3), rnorm(n-m,2,9)
Duncan Murdoch
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