Bland Altman Graph

[sarah dyball]

Hi,
Just started using stata 13
I've created a Bland-Altman plot using the 'baplot' function, however, the axis labeling given is not detailed and ideally I'd like numbers at regular intervals.
I've tried searching for a solution here but couldn't find one. Any help would be greatly appreciated.
Many thanks,
Sarah

[Nick Cox]

baplot (SSC) is a user-written program written for Stata 6. It's a command, not a function.

As of 6 June 2017, we are on Stata 15. The way this bites is that the graphics of baplot are ancient.
And its help is out-of-date therefore.

But in Stata >7

help gr7axes

is relevant and something like

baplot y x, xla(0/6) yla(-6(2)8)

will give you more axis labels. You don't tell us what your variables are called.

Talking of grinding axes, I'd point to concord in the same territory which supports modern Stata graphics. The original paper in STB-43 is the fullest write up, but download from the files for SJ 10-4.

search concord brings up this stuff (and some other stuff) but with a clickable link for SJ 10-4.

SJ-10-4 st0015_6  . . . . . . . . . . . . . . . .  Software update for concord
        (help concord if installed) . . . . . . . T. J. Steichen and N. J. Cox
        Q4/10   SJ 10(4):691
        update explicitly supporting plot() and addplot() and
        allowing systematic control of the reference line

SJ-8-4  st0015_5  . . . . . . . . . . . . . . . .  Software update for concord
        (help concord if installed) . . . . . . . T. J. Steichen and N. J. Cox
        Q4/08   SJ 8(4):594
        dialog box modified to correct visual layout problems

SJ-7-3  st0015_4  . . . . . . . . . . . . . . . .  Software update for concord
        (help concord if installed) . . . . . . . T. J. Steichen and N. J. Cox
        Q3/07   SJ 7(3):444
        now compatible with Stata 10; help file updated

SJ-6-2  st0015_3  . . . . . . . . . . . . . . . .  Software update for concord
        (help concord if installed) . . . . . . . T. J. Steichen and N. J. Cox
        Q2/06   SJ 6(2):284
        updated for compatibility with Stata 9 by() option

SJ-5-3  st0015_2  . . . . . . . . . . . . . . . .  Software update for concord
        (help concord if installed) . . . . . . . T. J. Steichen and N. J. Cox
        Q3/05   SJ 5(3):470
        minor bug fix for concord

SJ-4-4  st0015_1  . . . . . . . . . . . . . . . .  Software update for concord
        (help concord if installed) . . . . . . . T. J. Steichen and N. J. Cox
        Q4/04   SJ 4(4):491
        rewritten to provide dialog, Stata 8 graphs, and two
        new tests

SJ-2-2  st0015  . . . . . .  A note on the concordance correlation coefficient
        (help concord if installed) . . . . . . . T. J. Steichen and N. J. Cox
        Q2/02   SJ 2(2):183--189
        correction based on an erratum for Lin's concordance
        correlation coefficient, and assessment of the impact of
        the change

sg84_3 from http://www.stata.com/stb/stb58
    STB-58 sg84_3.  Concordance correlation coefficient:  minor corrections /
    STB insert by Thomas J. Steichen, RJRT / Nicholas J. Cox, University of
    Durham, UK / Support:  [email protected], [email protected] / After
    installation, see help concord

sg84_2 from http://www.stata.com/stb/stb54
    STB-54 sg84_2. Concordance correlation coefficient: update for Stata 6 /
    STB insert by Thomas J. Steichen, RJRT / Nicholas J. Cox, University of
    Durham, UK / Support:  [email protected] / After installation, see help
    concord

sg84_1 from http://www.stata.com/stb/stb45
    STB-45 sg84_1.  Concordance correlation coefficient, revisited. / STB
    insert by / Thomas J. Steichen, RJRJ; / Nicholas J. Cox, University of
    Durham, UK. / Support:  [email protected] and [email protected] /
    After installation, see help concord.

sg84 from http://www.stata.com/stb/stb43
    STB-43 sg84.  Concordance correlation coefficient. / STB insert by /
    Thomas J. Steichen, RJRT; / Nicholas J. Cox, University of Durham, UK. /
    Support:  [email protected] and [email protected] / After
    installation, see help concord.

[sarah dyball]

Great, that's sorted it thank you for your help.
The only thing is that the circles marking the data points were larger where there was overlapping data (i.e. the dot at 0,0 is larger to denote multiple patients with those values), on the new graph the dots are all the same size. Do you know how to alter this back?
Thanks again
Sarah

[sarah dyball]

Great, that's sorted it thank you.
The only thing is now the new graph does not have bigger circles/ dots to note multiple data points with the same mean difference/ average (i.e. previously the circle was bigger at 0,0)
Do you know how I could change this back
Thanks again
Sarah

[Nick Cox]

There is no option in concord to use differing symbol sizes, if that is what you are asking. I might jitter points.

Conversely on closer inspection it seems that your data are integers or perhaps even grades out of 10 or some such. See

the thread started by http://www.stata.com/statalist/archive/2010-12/msg00478.html

Section 6 in http://www.stata-journal.com/sjpdf.h...iclenum=gr0053
for a write-up of my suggestion there

http://www.statalist.org/forums/foru...updated-on-ssc for more on tabplot

http://www.stata-journal.com/article...article=gr0066 for a write-up of tabplot

[Nick Cox]

I am worried on your behalf about a point with average 4, difference 8.

That implies one measurement or evaluation of 0 and one of 8.

!!!

If those are the answers, what is the question?