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129 lines
4.5 KiB
Plaintext
129 lines
4.5 KiB
Plaintext
{smcl}
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{* 9May2008}{...}
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{cmd:help batplot}
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{hline}
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{title:Title}
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{hi: Produces a Bland-Altman plot when there is a relationship between paired differences and their average}
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{title:Syntax}
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{p 8 17 2}
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{cmdab:batplot} {it:varname1 varname2} [if] [in]
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[{cmd:,} {it:options}]
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{synoptset 20 tabbed}{...}
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{synopthdr}
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{synoptline}
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{syntab:Main}
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{synopt:{opt info:}} specifies that the percentage of points outside the limits of agreement are displayed as a subtitle.{p_end}
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{synopt:{opt val:abel}({varname})} specifies that the points outside the limits of agreement be labelled using the variable {it:varname}.{p_end}
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{synopt:{opt shading:}(min max)} specifies the extent of shading beyond the range of the data.{p_end}
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{synopt:{opt notrend:}} specifies that the original Bland-Altman plot (without a trend) be plotted.{p_end}
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{synopt:{opt moptions:}} specifies options for the markers that lie outside the limits of agreement.{p_end}
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{synopt:{opt sc:atter}} specifies options for the scatter part of the final plot, see {help scatter}.{p_end}
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{synopt:{help twoway_options}} specifies options for example titles and labels.{p_end}
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{synoptline}
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{p2colreset}{...}
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{title:Description}
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{pstd}
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{cmd:batplot} produces a Bland-Altman plot adjusted for trend.
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{pstd}
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The standard Bland-Altman plot is between the difference of paired variables versus the average, this is produced
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using the {bf:notrend} option. The main addition that this command handles is when there is a linear relationship between
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the the paired difference and the paired average. A regression model is used to adjust the limits of agreement accordingly.
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This is particularly useful when the two variables might be measured on different scales and hence a straight conversion
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factor would recalibrate the two variables.
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{title:Options}
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{dlgtab:Main}
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{phang}
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{opt info:} specifies that the percentage of points outside the limits of agreement are displayed as a subtitle. Additionally
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when using the notrend option the limits of agreement and mean difference are included in the subtitle.
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{phang}
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{opt val:abel}({varname}) specifies that the points outside the limits of agreement be labelled using the variable {it:varname}.
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{phang}
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{opt shading:}(min max) specifies the extent of shading beyond the range of the data. The default is that the limits of
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shading is determined by the values in the {hi:xlabel} option.
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{phang}
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{opt notrend:} specifies that the original Bland-Altman plot (without a trend) be plotted.
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{phang}
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{opt moptions:} specifies options for the markers that lie outside the limits of agreement, the options can be anything from
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the scatter marker options {help scatter##marker_options}.
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{phang}
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{opt sc:atter} specifies options for the scatter part of the final plot.
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{title:Examples}
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{pstd}
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Using the {hi:auto.dta} dataset supplied with STATA 8 this command can check whether there is agreement between
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turning circle (ft) and miles per gallon, click the highlighted text in order,
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{phang}{stata sysuse auto, clear}
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{phang}{stata batplot mpg turn}
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{pstd}
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This is the most basic graphic and using twoway options the look can be improved by clicking below,
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{phang}
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{stata batplot mpg turn, title(Agreement between mpg and turn) xlab(26(4)38) }
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{pstd}
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By specifying extra options the outlying points can be labelled and identified by the car make,
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{phang}
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{stata batplot mpg turn, title(Agreement between mpg and turn) info valabel(make) xlab(26(4)38) }
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{pstd}
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To obtain the original Bland Altman plot use the notrend option,
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{phang}
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{stata batplot mpg turn, title(Agreement between mpg and turn) info valabel(make) notrend xlab(26(4)38) }
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{pstd}
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To improve the labelling of the point VW it may be preferable to change the clock position of the label i.e.
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labels could appear to the left of the point. This is handled below with {hi: moptions()}.
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{phang}
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{stata batplot mpg turn, title(Agreement between mpg and turn) info valabel(make) notrend xlab(26(4)38) moptions(mlabp(9))}
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{pstd}
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Additionally in the case of multiple scatter points by using the {hi:scatter()} option the user can specify to "{hi:jitter}" datapoints
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{phang}
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{stata batplot mpg turn, notrend xlab(26(4)38) moptions(mlabp(9)) sc(jitter(4))}
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{title:Author}
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{p}
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Adrian Mander, MRC Human Nutrition Research, Cambridge, UK.
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Email {browse "mailto:adrian.mander@mrc-hnr.cam.ac.uk":adrian.mander@mrc-hnr.cam.ac.uk}
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{title:Also see}
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Related commands
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HELP FILES
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{help baplot} (if installed)
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