finding unique id per visit da

[Dhana18]

Good morning,

I have a data set like this.  I want to know mean number of visit per patient.  Same Incidentid and different visdate means same patient visiting clinic more than one time on different dates.   

How to code for the result i want?

IncidentID	VISDATE
1	7/3/2017
2	7/3/2017
3	7/5/2017
4	7/5/2017
5	7/5/2017
6	7/7/2017
6	7/5/2017
7	7/5/2017
8	7/5/2017
8	7/7/2017
9	7/5/2017
10	7/6/2017
11	7/6/2017
12	7/6/2017
12	7/17/2017
13	7/6/2017
14	7/7/2017
15	7/12/2017

[Jagadishkatam]

Hope this helps

data have;
input IncidentID VISDATE:mmddyy10.;
cards;
1  7/3/2017
2  7/3/2017
3  7/5/2017
4  7/5/2017
5  7/5/2017
6  7/7/2017
6  7/5/2017
7  7/5/2017
8  7/5/2017
8  7/7/2017
9  7/5/2017
10 7/6/2017
11 7/6/2017
12 7/6/2017
12 7/17/2017
13 7/6/2017
14 7/7/2017
15 7/12/2017
;

proc sort data=have nodupkey;
by IncidentID VISDATE;
run;

proc freq data=have;
table IncidentID/out=want;
run;