[R] contour for plotting confidence interval on scatter plot of bivariate normal distribution

[drflxms]

Please allow one (hopefully ;) last question:
Do you think the code I adopted from Hänggi is valid in selecting a
contour which encloses i.e. 68% of the scatter-plot data? - I am still
not completely shore... still looking for the reason of the different
result of Hänggis and Foresters code. Should be equivalent in theory.

Felix

Am 03.03.12 22:13, schrieb peter dalgaard:
> 
> On Mar 3, 2012, at 20:25 , drflxms wrote:
> 
>> "Once you go into two dimensions, SD loses all meaning, and adding
>> nonparametric density estimation into the mix doesn't help, so just stop
>> thinking in those terms!"
>>
>> This makes me really think a lot! Is plotting the 0,68 confidence
>> interval in 2D as equivalent to +-1 SD really nonsense!?
> 
> 
> Nono.., a 68% CI (or rather, prediction region) is a 68% region, no problem in that. And choosing that particular value because it is traditional in 1D quite defensible. It's just that there is nothing (at least not anything obvious) that it corresponds to 1SD of.
>