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89 lines
3.5 KiB
Plaintext
89 lines
3.5 KiB
Plaintext
7 months ago
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***********************************************************************************************************************
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**** Program blandaltman (one parameter against another parameter) startet ********************************************
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***********************************************************************************************************************
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* set more off
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* capture program drop blandaltman
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program blandaltman
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syntax varlist(max=2)
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// prepare for Bland Altman Interreader
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tempvar diff_xy
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tempvar avg_xy
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tempvar lower
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tempvar higher
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tempvar MW
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tempvar SE
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tempvar CIhigher
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tempvar CIlower
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generate `diff_xy'=0
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generate `avg_xy'=0
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generate `lower'=0
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generate `higher'=0
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generate `MW'=0
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generate `SE'=0
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generate `CIhigher'=0
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generate `CIlower'=0
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// count the variable: how many variable are in the list?
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local noofvars : word count `varlist'
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display as text "The variable list of this program counts " `noofvars' " variables"
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display as result " "
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display as result " "
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// Interreader
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local x = 1
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local y = 1
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foreach varx of varlist `varlist' {
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foreach vary of varlist `varlist'{
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if `y' >`x'{
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quietly replace `avg_xy'=(`varx'+`vary')/2
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quietly replace `diff_xy'=`varx'-`vary'
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display as result " Bland Altman Plot of `varx' and `vary'"
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quietly sum `diff_xy'
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quietly return list
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quietly replace `MW'=r(mean)
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quietly replace `lower'=r(mean)-2*r(sd)
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quietly replace `higher'=r(mean)+2*r(sd)
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quietly replace `SE'=(r(sd))/(sqrt(r(N)))
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quietly replace `CIlower'=r(mean)-2*`SE'
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quietly replace `CIhigher'=r(mean)+2*`SE'
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display as result "- mean of difference between `varx' and `vary' is "r(mean)
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display as result "- sd of difference between `varx' and `vary' is "r(sd)
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display as result "- lower limit of difference between `varx' and `vary' is " `lower'
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display as result "- higher limit of difference between `varx' and `vary' is " `higher'
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display as result "- Limits of agreement (Reference Range for difference): " `lower' " to " `higher'
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display as result "- Mean difference:" `MW' " (CI " `CIlower' " to " `CIhigher' ")"
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display as result " "
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display as result " "
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label var `diff_xy' "Values"
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label var `MW' "mean of difference"
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label var `lower' "lower limit of agreement"
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label var `higher' "higher limit of agreement"
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twoway (scatter `diff_xy' `avg_xy', msymbol(smcircle_hollow) mcolor(ebblue)) (line `MW' `avg_xy', lcolor(red))(line `lower' `avg_xy', lcolor(black) ) (line `higher' `avg_xy', lcolor(black) ), title(Bland Altman Plot, size(8)) subtitle(,size(5)) xtitle(Average of `varx' and `vary') ytitle(Difference of `varx' and `vary') caption() note(NOTE) legend(off)
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}
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local y = `y'+1
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}
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local y = 1
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local x =`x'+1
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}
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end
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***********************************************************************************************************************
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**** Program blandaltman (one parameter against another parameter) endet **********************************************
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***********************************************************************************************************************
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// EXAMPLE
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* sysuse bpwide.dta
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// to create a bland altman plot use the command "blandaltman" with variable1 and variable2
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* blandaltman bp_before bp_after
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