[R] [FORGED] how to draw the confidence interval

Rolf Turner r.turner at auckland.ac.nz
Mon Mar 6 09:08:26 CET 2017

On 06/03/17 19:35, laomeng_3 wrote:

> this is not homework, just a case which I made by myself.

Be that as it may, if you are going to use R you should learn something 
about using R, rather than treating it as a magical black box.

There is, as far as I know (not really very far!) no currently existing 
function to "draw the confidence intervals".  (Well, actually there is 
probably one out there somewhere.  There is so *much* out there.  But 
finding it is probably more effort than rolling your own.)

It is actually very easy to roll your own --- I think I could do it in 5 
or 10 minutes.  But I am *NOT* going to.  (a) I am not going to do your 
work for you, even if it's not homework, and (b) you will *learn* 
something by figuring out how to do it yourself.

Hint:  Read up on the functions lines() and segments().  And maybe 
arrows().  The function abline() might be of use as well.


Rolf Turner

Technical Editor ANZJS
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276

> On 2017-03-06 06:47 , Rolf Turner <mailto:r.turner at auckland.ac.nz> Wrote:
>     On 04/03/17 19:39, laomeng_3 wrote:
>     > hi all I have a question about drawing the confidence interval .
>     >
>     > For instance,if I want to sample 100 times,and each time,the sample
>     > size is 10,and the mean and sd is 15 and 1 respectively .I want to
>     draw
>     > the 100 confidence intervals(as the attachment) .Which function
>     should
>     > be used to draw the confidence interval ?
>     This list does not answer questions about homework.
>     (BTW, no attachment came through; only a *very* limited range of file
>     types is permitted for attachments).

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