The Migrant Household-Level Identifiers
Restricted-Use Data
The migrant household identifiers basically begin with the migrant
questionnaire identification number that appears on the front of the
migrant questionnaires. This questionnaire identification number
was filled-in when the interviewer made an attempt (successful or not) at interviewing a
study migrant.
In 2000, due to interviewers using the same questionnaire identification numbers
across the two phases (Rural to Urban and Rural to Rural), a migrant
follow-up type identifier variable was added later to keep from having
duplicate identifiers. Below are the variable names for the migrant household identifiers:
1994 Survey
|
2000 Survey
|
MID
|
MID00
MIGTYPE
|
The main migrant household identifiers are different in format across the two years. The 1994 identifier,
MID, is in numeric
format with a
length of 7 digits. The first four digits represent the
migrant's 1994 origin village number, while the last three digits are a
simple sequential number. The
2000 identifier,
MID00, is in alphanumeric format
(with leading zeroes) with a length of 11 digits. The first six digits represent the
migrant's 2000 origin village number, while the last five digits are a
simple sequential number. The
MIGTYPE
variable in 2000 is in alphanumeric format and has a length of four
digits. The main values are in short-hand format which points to the phase:
'R2U' for Rural to Urban and 'R2R' for Rural to Rural.
There are two other values that point to migrants within the
particular follow-up phase who returned back to the origin village to
live: 'R2UR' for Rural to Urban Returned and 'R2RR' for Rural to
Rural Returned.
Public-Use Data
Due to reasons of confidentiality, a new set of migrant household
identifier variables was created for the
public-use data
archive. The values for this new set of variables were
randomly generated based on the original values from the original
migrant household identifiers. Each variable name has a
"PMID" prefix followed by the last two digits of the
survey year:
1994 Survey
|
2000 Survey
|
PMID94
|
PMID00
|
The public-use migrant household identifiers are in numeric format, start with
1 and increase to the total number of migrant households in that particular survey
year.
