AAPOR Response Rate 1, and AAPOR Response Rate 2.

In order to understand those definitions, we need to go through a number of

the dispositions, the outcomes of a case that AAPOR has enumerated.

And you'll see these variables essentially in the response rate calculations that

we'll turn to next.

So RR stands for response rate.

I stands for complete interview.

P for partial interview.

R for refusals and break-offs.

So refusal is a case that has been contacted.

A sample member that has been contacted and

refused to participate, indicated they would not go further.

A break-off refers to a case that agreed to participate and

actually began the interview, but terminated it after some point.

And so there's no data beyond a certain point.

So there it's not exactly the same as missing data.

Break-offs are treated as somewhere between, generally between

non-respondents, and respondents with missing data.

NC stands for non-contact, so this is a case or sample unit, sample member,

who was unreachable in whatever mode is available.

They never answered the phone or answered the door.

Never replied to an email invitation or clicked on a link.

Other, so just another category of cases that aren't otherwise handled.

Unknown if household is occupied.

UO, unknown other.

So, the most important of these will become evident in a moment.

So, the equation or formula for

Response Rate 1 is the number of completed interviews,

i, divided by a number that's going to be larger than that.

So it's the number of complete interviews, plus the number of partial interviews, and

then a term corresponding to the number of non interviews, refusals and

break offs, plus non-contacts, plus others, that's this term here.

And then a term for, basically,

all the unknown cases, cases of unknown eligibility.

So again, it's the completed interviews divided by almost everything else.

Interviews, and partial interviews, and those who couldn't be contacted, and

those who were contacted and refused, and the other cases.

Response Rate 2 is similar to Response Rate 1, but

it includes partial interviews in the numerator.

So a partial interview is treated just as a completed case is treated.

And so what that means,

is that Response Rate 2 is generally going to be larger than Response Rate 1.

Because the definition of a response is both an interview that's completed, and

an interview that has been started, but not necessarily completed.

In our next segment we'll focus on the difference between response rate or

non-response rate, and non-response error.