In Global Context: Mental Health Study
Indiana University . Bloomington . Indiana
Argentina Sample Design
Plan and Timeline
design proposed is a multi stage stratified random sample, based on 26
are the urban districts with 300,000 population or more (#1 to #14)
are the largest urban districts from the
are the urban districts of 2,000 to 299,999 people in all regions except
stratum is composed of urban districts of 2,000 to 99,999 people in
strata #17 to #21, two urban districts will be selected, with probability
proportional to size.
strata #22 to #26, two rural areas will be selected by drawing random
coordinates on each stratum’s map.
points in the table below will be determined within the 26 urban districts
(strata #1 to #21), and within the 10 rural areas (strata #22 to #26).
determination of an urban sample point rests on the listing of radios1,
requiring two steps:
Selecting radios with
probability proportional to size.
Selecting the initial
block by drawing random coordinates on the maps of those radios.
rural sample point will be determined by the nearest locality to the
random coordinates, where 3 grouped and 6 dispersed individuals could be
urban sample point will be formed by 3 blocks. A map with these blocks,
numbered 1 to 3, will be provided to every interviewer. The starting
household will be marked in block 1.
persons will be interviewed within each urban sample point. The field
procedures are described in the following flow chart.
completed questionnaires will be immediately edited after interviewers
finish each sample point. The edited questionnaires will be coded before
data file must include a weight field, given that the design is not a self
weighted one. The weights, for estimating totals will rest on population
size, according to the usual formulas for multi stage stratified sampling.
for pre-fielding and fielding activities
INDEC divides the urban
districts into census fractions, and the later into smaller units
called “radios”. A radio has several blocks with near 300
households each. For each urban district the listing of its radios can
be obtained. These listings provide for each radio their population
and level of overcrowding.
1022 E. Third Street, Bloomington, IN 47405 (812) 855-3841