Martin Maechler says in reply to Sergueï Sokol
> Note the 'Subject' you've chosen for this thread,
"... does not produce the correct Tukey line",
The choice of title was mine not Serguei's; I posted the original message
where the error was pointed out
I agree with Martin's assessment that the c
d generate the line of identity for the (1:9, 1:9)
>>> case, so I do suspect that we have a genuine scr*wup in line().
>>>
>>> Notice, incidentally, that
>>>
>>> line(1:9+rnorm(9,,1e-1),1:9+rnorm(9,,1e-1))
>>>>
>>> Call:
>
y a search on *tukey three group line* and
you'll get plenty of hits) is pretty much a giveaway.
On Mon, May 29, 2017 at 2:19 PM, GlenB wrote:
> Tukey divides the points into three groups, not the x and y values
> separately.
>
> I'll try to get hold of the book for a direct
Tukey divides the points into three groups, not the x and y values
separately.
I'll try to get hold of the book for a direct quote, might take a couple of
days.
On Mon, May 29, 2017 at 8:40 AM, Duncan Murdoch
wrote:
> On 27/05/2017 9:28 PM, GlenB wrote:
>
>> Bug: stats
Bug: stats::line() does not produce correct Tukey line when n mod 6 is 2 or
3
Example: line(1:9,1:9) should have intercept 0 and slope 1 but it gives
intercept -1 and slope 1.2
Trying line(1:i,1:i) across a range of i makes it clear there's a cycle of
length 6, with four of every six correct.
Bu
