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MLP Linking Features — by step and census year

FEATURE Step 1 Step 2 Step 3
Name
First name JW-score All years All years All years
Standardized first name JW-score All years All years All years
Last name JW-score All years All years All years
First name soundex All years All years All years
Last name soundex All years All years All years
Middle name initial match All years All years All years
First name initial of census A person matches first or middle name initial of census B person All years All years All years
Middle name initial of census A person matches first or middle name initial of census B person All years All years All years
 
Race
Race, ipums general codes, categorical All years All years All years
Racetype match All years All years All years
Racetype and racetype match interaction All years All years All years
 
Uniqueness and popularity
N potential matches All years All years All years
N potential matches, squared All years All years All years
Whether exact match on the first and last name All years All years All years
Whether exact match on the first name, last name, birthplace and birthyear All years All years All years
Number of individuals with same sex, same first and last name, birthyear +/-3 in census A All years All years
Number of individuals with same sex, same first and last name, birthyear +/-3 in census A, squared All years All years
 
Birthplace
Birthplace match Blocking variable All years Blocking variable
Region of birthplace All years All years All years
 
Birth year
Absolute birthyear difference All years All years
Absolute birthyear difference, categorical All years All years
 
Household information
Father is present in both censuses All years All years All years
Father first name JW-score All years All years All years
Father's birthplace match All years All years All years
Father caution: something does not match about the father (birthplace, birth year, existence of step father) All years All years All years
Father caution, father presence, father JW interaction All years All years All years
Mother is present in both censuses All years All years All years
Mother first name JW-score All years All years All years
Mother's birthplace match All years All years All years
Mother caution: something does not match about the mother (birthplace, birth year, existence of step mother) All years All years All years
Mother caution, mother presence, mother JW interaction All years All years All years
Spouse present in both censuses All years All years
Spouse JW-score All years All years
Spouse caution: whether something does not match about the mother (birthplace, birth year) All years All years
Spouse caution and spouse JW interaction All years All years
Marriage duration match 1900-1910 1900-1910
Relatives with the same names present in both censuses All years All years All years
Unrelated household members with the same name present in both censuses All years All years All years
Relationship type 1880-1950 1880-1950
Relationship match 1880-1950 1880-1950
Relationship type and match interaction 1880-1950 1880-1950
Highest Jaro-Winkler score of competing match in household All years
Highest Jaro-Winkler score of competing match in household, conditional on sex All years
 
Location
Common neighbors in both censuses All years All years
County distance All years All years
County distance, squared All years All years
Street of residence match 1880-1950 1880-1950
 
Immigration
Foreign born or not All years All years All years
Immigration year caution: the difference between immigration year is greater than 5 1900-1930 1900-1930 1900-1930
Immigration year difference 1900-1930 1900-1930 1900-1930
Foreign born and immigration year caution interaction 1900-1930 1900-1930 1900-1930
Foreign born and birthplace match interaction All years
Second generation immigrant or not All years All years All years
 
Gender
Sex match Blocking variable All years Blocking variable