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From |
Richard Williams <richardwilliams.ndu@gmail.com> |

To |
statalist@hsphsun2.harvard.edu, statalist@hsphsun2.harvard.edu |

Subject |
Re: st: problem with predicted probabilities |

Date |
Sun, 02 Feb 2014 16:23:40 -0500 |

At 04:58 AM 2/2/2014, Witness Chirinda wrote:

Dear Statalist I want to obtain some predicted probabilities after logistic regression, as attached. I want to use the predicted probabilities in my next step instead of observed prevalence since the latter are adjusted for other (socio-demographic) factors. My problem is that the when I run - estat classification- it giving 0s for + classification. I am sure I am doing it the wrong way somewhere. Please see below output. All variables used in the model have been recorded to be binary 1/0 Thanks for any help! ------------------ . logistic Health_stat age maried wealth educat place sex Logistic regression Number of obs = 2339 LR chi2(6) = 50.61 Prob > chi2 = 0.0000 Log likelihood = -996.02516 Pseudo R2 = 0.0248 ------------------------------------------------------------------------------ Health_stat | Odds Ratio Std. Err. z P>|z| [95% Conf. Interval] -------------+---------------------------------------------------------------- age | 1.109083 .0342696 3.35 0.001 1.043909 1.178326 maried | 1.2134 .1962535 1.20 0.232 .8837556 1.666004 Wealth | 1.430957 .1784661 2.87 0.004 1.120641 1.827203 educat | 1.670411 .2010455 4.26 0.000 1.319397 2.11481 place | .9334522 .1223134 -0.53 0.599 .7220318 1.206779 sex | 1.129008 .1324642 1.03 0.301 .8970722 1.420911 . estat class Logistic model for poorSRHS -------- True -------- Classified | D ~D | Total -----------+--------------------------+----------- + | 0 0 | 0 - | 370 1969 | 2339 -----------+--------------------------+----------- Total | 370 1969 | 2339 Classified + if predicted Pr(D) >= .5 True D defined as poorSRHS != 0 -------------------------------------------------- Sensitivity Pr( +| D) 0.00% Specificity Pr( -|~D) 100.00% Positive predictive value Pr( D| +) .% Negative predictive value Pr(~D| -) 84.18% -------------------------------------------------- False + rate for true ~D Pr( +|~D) 0.00% False - rate for true D Pr( -| D) 100.00% False + rate for classified + Pr(~D| +) .% False - rate for classified - Pr( D| -) 15.82% -------------------------------------------------- Correctly classified 84.18% -------------------------------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

------------------------------------------- Richard Williams, Notre Dame Dept of Sociology OFFICE: (574)631-6668, (574)631-6463 HOME: (574)289-5227 EMAIL: Richard.A.Williams.5@ND.Edu WWW: http://www.nd.edu/~rwilliam * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: problem with predicted probabilities***From:*Witness Chirinda <witchirinda@gmail.com>

**References**:**st: problem with predicted probabilities***From:*Witness Chirinda <witchirinda@gmail.com>

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