Question

Status:Closed    Asked:May 18, 2016 - 07:00 AM

Can anyone please tell me what a "." value in a stata file mean for a panel respondent? Indonesia Dataset

I am trying to look at migration trends between 2000 and 2010 and when I merged the two samples for the respective years, Curiously observations appear as follows (see Image 1)


the serial and pernum identifies the dataset uniquely. The above screen shot is just a quick browse of households with serial number 1000. But there are about 2.3 crore observations.



id2010a_di~5- district 5 years ago asked in 2010

id2000a_re~r district 5 yaers ago asked in 2000


Question is- What does the "." under the variable id2010a_di~5 really mean? For every individual who has a value for variable id2000a_re~r there are no corresponding values-represented by"."- for id2010a_di~5 and vice versa. It cannot be the case that there has not been any migration from 2000 to 2010. So I am missing some link. Is it the interpretation of the "."?


I used count if (id2010a_dist5!=id2000a_reg5yr) & id2010a_dist5!=. & id2000a_reg5yr!=.

and it said 0. Basically I expected that this would give me number of people who migrated between 2000 and 2010.


Help Needed.


Thanks,



 
Do you have the same question? Follow this Question
 

Staff Answer

avatar

Tim_Moreland

Staff

The IPUMS-International microdata is cross-sectional, not panel data. As a result, the sample of households in the 2010 Indonesian Census is distinct from the 2000 Census sample and the SERIAL variable identifies households uniquely within a sample only, not across samples.


This means that a Stata value of "." signals a question was not asked in that sample year's questionnaire. Specifically, ID2000A_REG5YR was collected in the 2000 Indonesian Census and ID2010A_DIST5 was collected in the 2010 Indonesian Census. Respondents in the 2010 sample are not asked where they lived 5 years prior to the 2000 Census, so this value will be missing in your data extract.


Hope this helps.

 

May 18, 2016 - 03:30 PM

0
0
Report it

OTHER QUESTIONS NEEDING ANSWERS

2010 Census 5% Sample
negative values of wtsupp 1975 and before
Why are not all the "not in the labour force" categories filled for the EMPST...
Health Insurance Unit in ACS versus MEPS
Login   |   Register

Recently Active Members

View More »

Share |