[External] Get a result but an error message as well ?

Hi Richard,

Thanks for your response.
However, how can I correct my R code knowing that I want, as a result, only one value : the mean of the 500 MSE_OLS values ?

Le mardi 19 mai 2020 ? 21:59:07 UTC+2, Richard M. Heiberger <rmh at temple.edu> a ?crit :

dim(my.data)

[1] ? 1 500

you have a matrix with a single row and 500 columns.
you gave a name to only the first column.

Look at the result of replicate().? it is a vector.? You transposed it into a one-row matrix.

? ?tmp <- replicate( 500, my.experiment() )
dim(tmp)

NULL

length(tmp)

[1] 500

dim(t(tmp))

[1] ? 1 500


On Tue, May 19, 2020 at 3:51 PM varin sacha via R-help <r-help at r-project.org> wrote:

Dear R-experts,

Here is my R code, I get a result but I also get an error message so I doubt I can trust the result I get.
What is going wrong ? Many thanks.

########################################
a<-c(2,4,3,4,6,5,3,1,2,3,4,3,4,5,65)
b<-c(23,45,32,12,23,43,56,44,33,11,12,54,23,34,54)
d<-c(9,4,5,3,2,1,3,4,5,6,4,9,10,11,18)

my.experiment <- function( ) {

OLS <- lm( a ~ b+d )
MSE_OLS<-mean(OLS$residuals^2)
return( c(MSE_OLS) )
}

my.data = t(replicate( 500, my.experiment() ))
colnames(my.data) <- c("MSE_OLS")
mean(my.data)
########################################
?