Creates an eligibility matrix, i.e. a @c z matrix, from immunization information for a set of individuals, e.g. observations derived from a Demographic and Health Survey (DHS), and a set of vaccination activity descriptions (e.g. campaigns).
a data frame with one row per observation and columns for @c date of observation and @c age of individual on that date; <i>Note: all ages should be in months</i>
a data frame with one row per activity and columns providing the activity's @c date and targeted age range, i.e. @c age.low and @c age.high
The @c z.matrix function loops through all the provided observations and campaigns. For each pairing, it is first determined if the campaign occurred before or after the observation (survey) date. If the vaccination campaign was after the observation date, then the individual's eligibility status is set to zero (0). Otherwise, if the campaign was completed before survey, then the eligibility status is based on age. If the individual's age, at the time of the campaign, was within age range, @code[age.low, age.high], of the immunization activity's target population, then eligibility is set to one (1). If the individual's age was not within the target age range, then eligibility is zero (0).
a matrix with one row per observation and one column per campaign; matrix cells contain a @c 1 if that individual was eligible for the campaign and @c 0 otherwise
The @c z.matrix function only considers campaigns, i.e. Supplemental Immunization Activities (SIAs). For non-SIA immunization activities, e.g. routine vaccinations, the eligibility status is always set to zero (0).
All vaccination activities are assumed to have been completed on the date provided (i.e. @p campaigns$date); separate start and end dates are not supported.
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