Understanding Society User Support

Dear Sir or Madam,

I would like to ask you the following questions concerning variables in wave 3 of Understanding Society.

My first set of questions is on the two variables c_paygwc (pay period: gross pay) and c_paynwc (pay period: take-home pay).
The two variables contain the answers to the question "How long a period did that cover?" and refer to the interviewee's last gross payment and take-home pay, respectively. Both of these variables have a category labeled "calendar month". My questions would now be:

- What is the difference between the categories "calendar month" and "four weeks"?
- Does the answer "calendar month" give any information about when the payment that the two variables refer to occurred? For example, does "calendar month" imply that the respective payment occurred at the end of the calendar month?
- Is there any other information available regarding the date the last payment was received? For example, "the last payment occured on 5 December". If not publicly available, would there be any such information that researchers could get access to under certain conditions?

My second set of questions concerns the cognitive test "Serial 7 Subtraction" in wave 3. In the manual for the cognitive tests (Understanding Society: UK Household Longitudinal Study: Cognitive Ability Measures; 6614_wave3_cognitive_ability_measures_v1_1), it says on page 12: "There is an error in the first item of Set 2. ... We are conducting analyses to assess the effects of this error." My actual questions would now be:

- Despite the error, is it possible to combine the test results from the randomly assigned Set 1 and Set 2 in one variable? What would be the consequences of the error in Set 2? In the current version of the data set, Set 1 and Set 2 have not been combined as far as I am aware.

I would be very grateful for your help.

Thank you very much,
Heinrich