Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: calculate maximum density of normal distribuion
From
Nick Bornschein <[email protected]>
To
[email protected]
Subject
Re: st: calculate maximum density of normal distribuion
Date
Fri, 22 Nov 2013 16:36:22 +0100
I want to end the xline at the peak of the distribution curve, xline
without any maximum just draws a line higher than the distributions maximum.
Am 22.11.13 16:34, schrieb Nick Cox:
If you know the mean, that fixes the position of the maximum; why do
you need any other information?
Nick
[email protected]
On 22 November 2013 15:32, Nick Bornschein <[email protected]> wrote:
Thanks, that worked!!
And now is the question: can I tell the xline (which is the mean) to end at
the maximum point somehow?
Am 22.11.13 16:29, schrieb Maarten Buis:
The mean won't do anything for the maximum, but the maximum is a
function of the standard deviation. It has to be otherwise the it
would not integrate to 1. So -normalden(0,$sd2)- will give you the
maximum.
-- Maarten
On Fri, Nov 22, 2013 at 4:23 PM, Nick Bornschein
<[email protected]> wrote:
Well, no.
The maximum density of a normal distribution of mean = 1 and sd = 2 is
around 0.2 (looking at the graph) and with mean = 5 and sd = 3 it's
around
1.125...so it's not always the same when I change the given mean and sd.
Am 22.11.13 16:12, schrieb Nick Cox:
That density is a constant, namely
. di normalden(0)
.39894228
Whatever mean a normal has just shifts the distribution left or right,
so makes no difference to what the peak density is; hence without loss
of generality we can focus on mean 0.
Whatever SD a normal has, 0/SD is still 0.
Correct me if I'm wrong....
Nick
[email protected]
On 22 November 2013 15:00, Nick Bornschein <[email protected]>
wrote:
Hello,
I'm calculating a normal distribution with:
set obs 10000
set seed 2211
gen normal2 = rnormal($mean2, $sd2)
by given mean and sd which I define via global macro.
Is it possible to calculate the maximum density at the mean point?
And more interesting: is it possible to define "xline" until a given
point
at the y axis (the maximum density as you can imagine) because I want
to
add
the mean line with going higher than the maximum density?
Best
-Nick
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/