Altogether I got five more or less silly solutions (not my judgment!), some of
them further discussed in private mail, for a problem where my expectation was
to get a simple one-liner back: "Check ?clt" or so...
Fortunately, with all of them I seem to arrive at a result that is consistent
with
Just to add to the silly solutions, here's how I would have done it...
mu <- 40
sdev <- 10
days <- 100:120 # range to explore
p <- 0.8
days[ match(TRUE, qnorm(0.2, mu*days, sqrt(sdev * sdev * days)) >= 4000) ]
Michael
On 9 January 2011 08:48, Bert Gunter wrote:
> If I understand what you have
If I understand what you have said below, it looks like you do NOT
have the problem solved manually. You CAN use qnorm , and when you do
so, your equation yields a simple quadratic which, of course, has an
exact solution that you can calculate in R.
Of course, one can use uniroot or whatever to so
On Sat, Jan 8, 2011 at 6:25 AM, Rainer Schuermann
wrote:
> It is _from_ a homework but I have the solution already (explicitly got that
> done first!) - this was the pasted Latex code (apologies for that, but in
> plain text it looks unreadable[1], and I thought everybody here has his / her
> f
On Sat, 8 Jan 2011, Rainer Schuermann wrote:
Sounds like homework, which is not an encouraged use of the Rhelp
list. You can either do it in theory...
It is _from_ a homework but I have the solution already (explicitly got
that done first!) - this was the pasted Latex code (apologies for th
On Jan 8, 2011, at 9:25 AM, Rainer Schuermann wrote:
Sounds like homework, which is not an encouraged use of the Rhelp
list. You can either do it in theory...
It is _from_ a homework but I have the solution already (explicitly
got that done first!) - this was the pasted Latex code (apologie
> Sounds like homework, which is not an encouraged use of the Rhelp
> list. You can either do it in theory...
It is _from_ a homework but I have the solution already (explicitly got that
done first!) - this was the pasted Latex code (apologies for that, but in plain
text it looks unreadable[1]
On Jan 8, 2011, at 6:56 AM, Rainer Schuermann wrote:
This is probably embarrassingly basic, but I have spent quite a few
hours in Google and RSeek without getting a clue - probably I'm
asking the wrong questions...
There is this guy who has decided to walk through Australia, a total
dist
This is probably embarrassingly basic, but I have spent quite a few hours in
Google and RSeek without getting a clue - probably I'm asking the wrong
questions...
There is this guy who has decided to walk through Australia, a total distance
of 4000 km. His daily portion (mean) is 40km with an sd
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