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# Re: st: how to get a two-line-graph for predicted probabilites in logistic regression model with a metric controll variable (SE10)

 From "Prof. Dr. Claudia Schuchart" <[email protected]> To [email protected] Subject Re: st: how to get a two-line-graph for predicted probabilites in logistic regression model with a metric controll variable (SE10) Date Mon, 03 Jun 2013 11:24:01 +0200

```Hi Maarten,
```
sorry for sending to you a private email - I just have read pt6 of Statalist FAQ. My problem is, that the twoway-command does not work and I could not find out a solution:
```. twoway rarea lb ub south if union == 0, astyle(ci) ||    ///
(...)
/ / / is not a twoway plot type
r(198);
.        rarea lb ub south if union == 1, astyle(ci2) ||   ///
unrecognized command:  rarea
r(199);
.        line pr south if union == 0 ||                    ///
/ / / is not a twoway plot type
r(198);
.        line pr south if union == 1,                      ///
option / not allowed
r(198);
.        legend(order(1 "95% CI" 3 "union" 4 "non-union")) ///
unrecognized command:  legend
(...)
Thank you,
Claudia

Am 5/29/2013 10:23 AM, schrieb Maarten Buis:
```
```For older versions of Stata you can use the -adjust- command for that like so:

*------------------ begin example ------------------
sysuse nlsw88, clear
xi: logit married age i.south*i.union

preserve
adjust age, by(south union) ci replace pr
twoway rarea lb ub south if union == 0, astyle(ci) ||    ///
rarea lb ub south if union == 1, astyle(ci2) ||   ///
line pr south if union == 0 ||                    ///
line pr south if union == 1,                      ///
legend(order(1 "95% CI" 3 "union" 4 "non-union")) ///
scheme(s2color) ylab(,angle(horizontal))          ///
xlab(0 "North" 1 "South")                         ///
xtitle(area of residence)                         ///
ytitle(predicted probability of being married)
restore
*------------------- end example -------------------
(For more on examples I sent to the Statalist see:
http://www.maartenbuis.nl/example_faq )

Hope this helps,
Maarten

On Tue, May 28, 2013 at 3:53 PM, Prof. Dr. Claudia Schuchart wrote:
```
```I did a graph with SE10 for predicted probabilites in a logistic regression
model. I controlled for intelligence (metric), and considered two indendent
binary vaiables as well as the interaction between them (N=187). I want to
have a two-line-graph (holding intelligence constant), instead I got
multiple graphs for any intelligence value:

xi: logit y i.a*i.b IQ
predict y, pr
separate y, by(b)
graph twoway line y0 y1 a , xlabel(1 2)

How can I get  a two line graph only?
```
```---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
---------------------------------
*
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```
```

--
*****************************************************
Prof. Dr. Claudia Schuchart
Lehrstuhl für Empirische Bildungsforschung
Leiterin Forschungsgruppe Schule und Bildung

Bergische Universität Wuppertal
School of Education
Institut für Bildungsforschung
Gaußstr. 20
D-42119 Wuppertal

Fon (Sekretariat): 0049/ 202 439 2325
Fon (direkt): 0049/ 202 439 3329
Fax: 0049/ 202 439 3681
Raum   S. 15.28
*****************************************************

```
```begin:vcard
fn:Prof. Dr.  Claudia Schuchart
n:Claudia Schuchart;Prof. Dr.
email;internet:[email protected]
version:2.1
end:vcard

```

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