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 Argentina Sample Design

Sampling Plan and Timeline

Sampling design

The design proposed is a multi stage stratified random sample, based on 26 strata:

14 are the urban districts with 300,000 population or more (#1 to #14)

 2 are the largest urban districts from the Patagonia region (#15, #16)

 4 are the urban districts of 2,000 to 299,999 people in all regions except Patagonia and Metropolitana (#17 to #20)

 1 stratum is composed of urban districts of 2,000 to 99,999 people in Patagonia region (#21)

   5 are composed of the rural population from each region (#22 to #26)

From strata #17 to #21, two urban districts will be selected, with probability proportional to size.

From strata #22 to #26, two rural areas will be selected by drawing random coordinates on each stratum’s map.

Sample 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).

The 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.

A rural sample point will be determined by the nearest locality to the random coordinates, where 3 grouped and 6 dispersed individuals could be interviewed.

A 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.

Three persons will be interviewed within each urban sample point. The field procedures are described in the following flow chart.

The completed questionnaires will be immediately edited after interviewers finish each sample point. The edited questionnaires will be coded before being recorded.

The 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.

Sample distribution:

Stratum #

Stratum name

# Urban districts (a)

# Rural areas (b)

Cases in (a) or (b)

Total cases

Sample points

1

Gran Buenos Aires

1

 

450

450

150

2

Ciudad de Buenos Aires

1

 

150

150

50

3

Gran Córdoba

1

 

75

25

4

Gran Rosario

1

 

75

75

25

5

Gran Mendoza

1

 

30

30

10

6

Gran San Miguel de Tucumán

1

 

30

30

10

7

Gran La Plata

1

 

30

30

10

8

Mar del Plata

1

 

30

30

10

9

Gran Salta

1

 

30

30

10

10

Gran Santa Fe

1

 

30

30

10

11

Gran San Juan

 

30

30

10

12

Gran Resistencia

1

 

30

30

10

13

Santiago del Estero

1

 

30

30

10

14

Gran Corrientes

1

 

30

30

10

15

Neuquén-Plottier

1

 

30

30

10

16

Comodoro Rivadavia

1

 

30

30

10

17

Cuyo

2

 

30

60

10

18

Noreste

2

 

30

60

10

19

Noroeste

 

30

60

10

20

Pampeana

2

 

30

60

10

21

Patagonia

2

 

30

60

10

22

Cuyo (rural)

 

2

9

18

3

23

Noreste (rural)

 

2

9

18

3

24

Noroeste (rural)

 

2

9

18

3

25

Pampeana (rural)

 

2

9

18

3

26

Patagonia (rural)

 

2

9

18

3

 

26

10

 

1500

435

Timeline for pre-fielding and fielding activities

 

 

Weeks

 

 

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

Sample  selection (radios, rural areas)

 

Materials needed for drawing the sample

X

X

X

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sample point maps

 

X

X

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Setting up the field work

 

Interviewer and editor instructions

X

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Printing material for pre testing

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pre testing

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Final questionnaire and instructions

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Printing questionnaires, instructions, etc.

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Assembling the interviewer kit

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Materials spatial distribution

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Training interviewers

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

Coordinating field work

 

Assigning interviewers and editors tasks

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Interviewing and editing time

 

 

 

 

 

 

 

X

X

X

X

X

X

 

 

 

 

 

 

 

Verification (20% of the questionnaries)

 

 

 

 

 

 

 

 

X

X

X

X

X

X

 

 

 

 

 

 

 

Organizing material reception

 

 

 

 

 

 

 

 

 

X

X

X

X

X

X

 

 

 

 

 

Processing the data

 

Coding

 

 

 

 

 

 

 

 

 

 

X

X

X

X

X

X

 

 

 

 

 

Double independent recording

 

 

 

 

 

 

 

 

 

 

 

X

X

X

X

X

X

 

 

 

 

Cleaning up the data base

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

Tayloring and recording weights

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X

 

 

Sending the data base

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X



 1 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.

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Last updated: 6 September 2005
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