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Scale-Up and Masking (with 2 questions)

For each interviewee, the questions below shall be asked for every name, there being 24 names total.

Only the order of names will be sampled, according to the Instructions for the deck of names, and must be registered.

Question-2 is asked only if the answer to Question-1 was not zero.

Question 1: How many people do you know named __________[name] ?

Question 2: How many of those know you __________[condition of the study, ex: had sex with another man in the last six months]?

Scale-Up and Masking (with 4 questions = 2 above + 2 extra)

Definitions

For a given NAME:

t = "total number of alters named NAME that the respondent knows"

k = "has name NAME and knows respondent uses drugs"

u = "has name NAME and respondent knows he uses drugs"

xy = x and y

~z = not z

Example

~k~u: alters who do not use drugs and have no knowledge of the respondent's use

Equations

ku + k~u + ~ku + ~k~u = t

ku + k~u = k

~ku + ~k~u = ~k

ku + ~ku = u

k~u + ~k~u = ~u

Questions

?t = T

?k = K

?u = U

?ku = KU

Examples

~k~u = ~u - k~u = t - u + ku - k = T - K - U + KU

k~u/~u = (k - ku) / (t - u) = (K - KU) / (T - U)