Other Identifiers

Beyond the basic identifiers, there are other identifiers that point to levels of analysis, including person years and plots.

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Person Years

Restricted-Use Data

Person year-level identifiers are found in the four Life History Calendar (LHC) data files that come from Form 5 in the 1994 Household Survey, Form 10 in the 1994 Migrant Follow-Up Survey, Form 5 in the 2000 Household Survey and Form 11 in the 2000 Migrant Follow-Up Survey.  Each record in a LHC data file represents a certain block of time in a person's life.  The Nang Rong Projects LHC forms were designed so that the block of time was an entire age or year in the person's life.   The interviewers would ask about certain events and location information for each age or year mostly starting with age 13 and going up until the person's current age, but there are exceptions (see the LHC forms document).  On each form, the age was pre-printed, while the buddhist era year was written-in by the interviewer to correspond with the person's age.   Given that both age and year were recorded, either variable can be used as the person year identifier.  Below are the variable names for each of the person year identifiers:

Person Year Variable	1994 Household Survey	1994 Migrant Survey	2000 Household Survey	2000 Migrant Survey
Age	Q5_1_1	Q10_1_1	X5_1AGE	X11_1AGE
Year	BEYEAR	BEYEAR	BEYEAR	BEYEAR

Each of the person year identifiers are in numeric format. 
 

Public-Use Data

The person year identifier variables are available in the public-use data and have not changed in any way. 

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Plots

Restricted-Use Data

Plot-level identifiers are found in the three plot data files, where one data file comes from Form 6 in the 1994 Household Survey and two data files come from Form 6 in the 2000 Household Survey.  Each record in a plot data file represents a plot that the household used in a certain growing season.  In question 15 on Form 6 in the 1994 Household Survey, the interviewers filled in a small plot chart where the first column was the plot number followed by questions on each plot including use, size and ownership.  The plot number then became the plot identifier variable.  In Form 6 of the 2000 Household Survey, the questions were much more extensive including size; joint usage; past, present and future use; crop types; ownership; crop losses; and adjacent plang use.  Furthermore, the term plang, rather than plot, was used, and this referred to "a single contiguous piece of land."   The plangs were divided into those used in the 1999-2000 growing season and those used in the 1998-1999 growing season.  Each had their own set of questions and each had their own set of plang numbers that were pre-printed on the questionnaire.  These plang numbers became the plang identfier variables.  Below are the variable names for each of the plot/plang identifiers:

1994 Household Survey	2000 Household Survey
1993-1994 Growing Season (plot)	1999-2000 Growing Season (plang)	1998-1999 Growing Season (plang)
Q6_15P	PLANG00	PLANG99

Each of the plot/plang identifiers are in numeric format ranging from 1 to 11. 
 

Public-Use Data

The plot identifier variables are available in the public-use data and have not changed in any way.