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As a last exercise use the following commands to generate a graph of the predicted values:
. quietly logit ins hhincome
. predict plogit, pr
. quietly probit ins hhincome
. predict pprobit, pr
. quietly regress ins hhincome
. predict pols, xb
. summarize ins plogit pprobit pols
. sort hhincome
.twoway (scatter ins hhincome, msize(vsmall)) (line plogit hhincome, lcolor(blue) lpattern
>(solid)) (line pprobit hhincome, lcolor(red) lpattern(tight_dot)) (line pols hhincome,
>lcolor(green) lpattern(longdash_shortdash)), ytitle(Predicted Probability) xtitle(Household income)
Note: save file as a .tif file if you want to insert the graph directly into a word file.
The determinants of physician advice. Physicians are expected to give lifestyle advice as a part of their normal interaction with their patients. Sometimes doctors choose not to comment on a patient’s lifestyle because they do not have time for personal comments, they feel the advice will be unwelcome, they feel that lifestyle choices are not any business of the physician, they find the discussion of lifestyle issues to be embarrassing, or they are not aware of the patient’s actual lifestyle choices. In this project we are interested in understanding when physicians choose to give advice concerning the consumption of alcohol.
The MS Excel file ktdata contains the responses to the 1990 National Health Interview Survey core questionnaire and special supplements from 2,467 males who were current drinkers in 1990. Individuals who are lifetime abstainers or who are former drinkers who have not consumed any alcohol in the past year are excluded from the sample. Table 7 contains the names and definitions of the variables collected in the survey.
| Variable | Definition |
| Drinks | Total number of drinks taken in the past two weeks |
| Advice | Did your physician give you advice about alcohol consumption? Yes = 1, No = 0 |
| Income | Monthly income in $1,000 (there are 5 missing values denoted by a “.”) |
| Age30 | Dummy variable equal to 1 if 30<Age ≤ 40and 0 otherwise |
| Age40 | Dummy variable equal to 1 if 40<Age ≤ 50 and 0 otherwise |
| Age50 | Dummy variable equal to 1 if 50<Age ≤ 60 and 0 otherwise |
| Age60 | Dummy variable equal to 1 if 60<Age ≤ 70 and 0 otherwise |
| AgeGT70 | Dummy variable equal to 1 if individual’s age is greater than 70 and 0 otherwise |
| Educ | Number of years of schooling (0 to 18) |
| Black | Dummy variable equal to 1 if the individual is a black and 0 otherwise |
| Other | Dummy variable equal to 1 if the individual is non-white and non-black and 0 otherwise |
| Married | Dummy variable equal to 1 if the individual is married and 0 otherwise |
| Widow | Dummy variable equal to 1 if the individual is a widow and 0 otherwise |
| DivSep | Dummy variable equal to 1 if the individual is either divorce or separated and 0 otherwise |
| Employed | Dummy variable equal to 1 if the individual is currently employed and 0 otherwise |
| Unemploy | Dummy variable equal to 1 if the individual is currently unemployed and 0 otherwise |
| NE | Dummy variable equal to 1 if the individual lives in the Northeast US and 0 otherwise |
| MW | Dummy variable equal to 1 if the individual lives in the Midwest US and 0 otherwise |
| South | Dummy variable equal to 1 if the individual lives in the South and 0 otherwise |
| Medicare | Dummy variable equal to 1 if the individual receives Medicare and 0 otherwise |
| Medicaid | Dummy variable equal to 1 if the individual receives Medicaid and 0 otherwise |
| Champus | Dummy variable equal to 1 if the individual has military insurance and 0 otherwise |
| HlthIns | Dummy variable equal to 1 if the individual has health insurance and 0 otherwise |
| RegMed | Dummy variable equal to 1 if the individual has a regular source of medical care and 0 otherwise |
| DRI | Dummy variable equal to 1 if the individual sees the same doctor and 0 otherwise |
| MajorLim | Dummy variable equal to 1 if the individual has limits on major daily activity and 0 otherwise |
| SomeLim | Dummy variable equal to 1 if the individual has limits on some daily activity and 0 otherwise |
| Diabetes | Dummy variable equal to 1 if the individual has diabetes and 0 otherwise |
| Heart | Dummy variable equal to 1 if the individual has a heart condition and 0 otherwise |
| Stroke | Dummy variable equal to 1 if the individual has had a stroke and 0 otherwise |
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