Temporal reasoning

Question

I'm having some difficulty in using temporal reasoning, I believe I'm nearly there but not quite.
Here's what I'm trying to work out:
the applicant is spending time with the person for at least 10 hours a week for at least 9 weeks of the last 19 weeks
Here is what I have underneath it at the moment:
intervalatleastdays(19 weeks before the relevant date, the relevant date, 63, the claimant regularly spends time with the person for at least 10 hours a week)
where
the claimant regularly spends time with the person for at least 10 hours a week > 10
and
19 weeks before the relevant date = addweeks(the relevant date,-19)
and
the relevant date is the date of the application
Can someone please take a look and let me know where this may be going wrong? In particular calculating the 9 weeks of the last 19 weeks
Many thanks

Answer 1

Depending on how tricky you want/need to get, you might be able to get away with just using regular entity reasoning.
Here are some ideas... (caveat: not properly tested, just ideas of an approach!)
Entity structure*
Containment relationship: Global --> one-to-many --> the week (relationship text: the weeks)
Rules*
the applicant has spent time with the person for at least 10 hours per week for at least 9 weeks of the 19 weeks prior to the application date if
the number of relevant weeks for which the applicant has spent at least 10 hours per week with the person >= 10
the number of relevant weeks for which the applicant has spent at least 10 hours per week with the person = InstanceCountIf(the weeks, the week should be included in the assessment)
the week should be included in the assessment if
the applicant has spent at least 10 hours with the person during the week and
the start date of the week >= the day 19 weeks before the application date and
the start date of the week <= the application date
the applicant has spent at least 10 hours with the person during the week if
the number of hours the applicant has spent with the person during the week >= 10
the day 19 weeks before the application date = AddWeeks(the application date, -19)
Comments*
With the rules above, you'd have an entity representing each week, and each of those weeks would have a start date and a number of hours the applicant spent with the person. At the Global level the input is the application date.
There are a whole lot of other things you'd need to consider though, such as:
* What is a "week"? Is it a week relative to the application date? I.e. If the application date falls on a Wednesday, does the week start on the prior Thursday? Or does a week always start on the same weekday, e.g. Monday. If a week always starts on a set weekday, then what happens if the application date falls on, say, a Friday? Is the start of the most recent week the Monday of that week? Or is it the Monday of the previous week (i.e. the Monday of the first full week)?
* How should the determination be handled if you don't have data for the 19 consecutive weeks prior to the application date?
* Do you need to determine a rolling eligibility? I.e. If you had 50 weeks of data, do you need to be able to pick any week and know (from the perspective of that particular week) whether the goal is satisfied -- obviously the answer could vary from week to week. This is possible using inferred relationships and cross entity reasoning.
Cheers,
Jasmine