> -----Original Message----- > From: Gabor Grothendieck [mailto:ggrothendi...@gmail.com] > Sent: Wednesday, March 04, 2009 3:17 AM > To: Daniel Nordlund > Cc: r-help@r-project.org > Subject: Re: [R] How to generate fake population (ie. not > sample) data? > > On Wed, Mar 4, 2009 at 2:48 AM, Daniel Nordlund > <djnordl...@verizon.net> wrote: > >> -----Original Message----- > >> From: r-help-boun...@r-project.org > >> [mailto:r-help-boun...@r-project.org] On Behalf Of CB > >> Sent: Tuesday, March 03, 2009 10:05 PM > >> To: David Winsemius > >> Cc: r-help@r-project.org > >> Subject: Re: [R] How to generate fake population (ie. not > >> sample) data? > >> > >> My understanding is that rnorm(n, x, s) will give me an > n-sized sample > >> from an (x, s) normal distribution. So the vector returned > will have a > >> mean from the sampling distribution of the mean. But what > I want is a > >> set of n numbers literally with a mean of x and sd of s. > >> > >> I am at the very beginning of my R journey, so my > apologies if this is > >> a particularly naive enquiry. > >> > >> 2009/3/4 David Winsemius <dwinsem...@comcast.net>: > >> > In what ways is rnorm not a satisfactory answer? > >> > > >> > -- > >> > David Winsemius > >> > > >> > On Mar 3, 2009, at 9:33 PM, CB wrote: > >> > > >> >> This seems like it should be obvious, but searches I've > >> tried all come > >> >> up with rnorm etc. > >> >> > >> >> Is there a way of generating normally-distributed > 'population' data > >> >> with known parameters? > >> >> > >> >> Cheers, CB. > >> >> > > > > Something like this may help get you started. > > > > std.pop <- function(x,mu,stdev){ > > ((x-mean(x))/sd(x)*stdev)+mu > > } > > Note the scale function, i.e. the above can also be written: > > stdev * scale(x) + mu > > Gabor,
Thanks for pointing out the scale() function for the OP. I suspected that something like that existed, but in a (very) quick look around didn't find it. Dan Daniel Nordlund Bothell, WA USA ______________________________________________ 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.
