Counting consecutive months

[SASTad]

Hello,

I'm trying to count six continuous eligible months or more in one calender year for a particular recepient in health insurance industry. For example, please find the sample data below:

Member_ID   Begin_Month    Begin_Year   End_Month     End_Year

   1                         3                     2008                4                   2008

   1                         5                     2008                8                    2008

   1                         9                     2008                11                  2008

   2                        1                     2008                 2                   2008

   2                         5                     2008                12                  2009

I'm trying to see if a member is eligible for a continuous period of six months during that particular year. The original data set has over 80,000 Member ID's. Could you please help me out with any suggestions.

Thank you.

[Ksharp]

What do you mean by " is eligible for a continuous period of six months during that particular year."  ?

How do you define continuous period of six months? it is for an individual row or Member_ID  ?

And you did not post the output you want to see yet , it is important .