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From |
Kim Oren Gradel <kim.gradel@ouh.regionsyddanmark.dk> |

To |
"'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu> |

Subject |
st: SV: Combining ROC curves in one graph |

Date |
Tue, 23 Aug 2011 12:30:20 +0200 |

Dear Stata-users, I have had the same problem, or at least a similar one, and I suggest a solution here: I have four multivariable logistic regression models. Model 1 has the outcome variable + X variables, Model 2 = Model 1 + var1, Model 3 = Model 1 + var2, and Model 4 = Model 1 + var1 + var2. I wanted the ROC curves from each of these models in one graph and did the following: /* Model 1: */ xi: logistic i.dod30 age i.kon i.charlindex i.bak i.afdtype_unik lsens, gensens(sens1) genspec(spec1) replace nodraw gen spec_1 = 1-spec1 /* Model 2: */ xi: logistic i.dod30 age i.kon i.charlindex i.bak i.afdtype_unik i.sepsis lsens, gensens(sens2) genspec(spec2) replace nodraw gen spec_2 = 1-spec2 /* Model 3: */ xi: logistic i.dod30 age i.kon i.charlindex i.bak i.afdtype_unik crp10 lsens, gensens(sens3) genspec(spec3) replace nodraw gen spec_3 = 1-spec3 /* Model 4: */ xi: logistic i.dod30 age i.kon i.charlindex i.bak i.afdtype_unik i.sepsis crp10 lsens, gensens(sens4) genspec(spec4) replace nodraw gen spec_4 = 1-spec4 /* This is admittedly primitive, but it works!!!!: */ gen line1=0 replace line1=1 if age>=60 gen line2 = line1 twoway (connect line1 line2, mcolor(black) xlabel(0(0.1)1) ylabel(0(0.1)1 , angle(horizontal))) /* */ (scatter sens1 spec_1 , msymbol(p) mcolor(black) legend(off)) /* */ (scatter sens2 spec_2 , msymbol(p) mcolor(red)) /* */ (scatter sens3 spec_3 , msymbol(p) mcolor(green)) /* */ (scatter sens4 spec_4 , msymbol(p) mcolor(blue)) Your models seem to be univariate, but instead of roctab refvar classvar you must be able to use logistics refvar classvar Good luck Kim Kim Oren Gradel Epidemiologist, Senior DVM, PhD The Danish Clinical Quality Improvement Programme Centre for National Clinical Databases, South OUH Odense University Hospital Department of Quality and Research / HTA Sdr. Boulevard 29, Entrance 101, 4th floor, DK-5000 Odense C Tel: +45 65 41 17 03 Fax: +45 65 91 72 64 E-mail: kim.gradel@ouh.regionsyddanmark.dk Web: www.KCSinfo.dk -----Oprindelig meddelelse----- Fra: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] På vegne af Kim Peeters Sendt: 19. august 2011 09:59 Til: Statalist Emne: st: Combining ROC curves in one graph Dear Stata-users, I have plotted three ROC curves using roctab x1 y1, graph name(rocgraph1) nodraw roctab x2 y2, graph name(rocgraph2) nodraw roctab x3 y3, graph name(rocgraph3) nodraw How can I combine these three roclines into one graph. || or (...) do not seem to work. Moreover, I would like to do the same thing after rocfit and rocplot: rocfit x1 y1 rocplot, confband name(rocfit1) nodraw rocfit x2 y2 rocplot, confband name(rocfit2) nodraw rocfit x3 y3 rocplot, confband name(rocfit3) nodraw Thank you for your advice. P.S. I don't want to array the separately drawn graphs into one using graph combine. I just need one graph that contains all three ROC lines. Best regards, Kim * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Combining ROC curves in one graph***From:*Kim Peeters <kimpeeters84@yahoo.com>

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