Home > Data Services > Catalog . Restricted Data . Census . ACS

Search Data Services

Meta Search
search across all the following databases:

Data Catalog
Data and documentation

KnowledgeBase
Common questions and answers.

Resources
Entire collection of data resources.


Latest Data News

RSS Feed icon

Breaking News: Protect the 2020 Census

The Fastest Growing US Cities Are Mostly In the West

Another rule from NIH: Demographers might get to ignore this one

Research on Health Disparities: Incarceration Matters

Changing Race From One Census to the Next

Data Services Knowledge Base

Q:  

I want to combine the 2005 and 2006 ACS microdata. What do I do to the weights?

A:  

Multiply the weight by 0.5. Assuming you are using the concatenated version of the ACS data and have selected the data for years 2005 and 2006:

nwgt = perwt * 0.5;
You need to be careful when you combine the two years. The group quarters population was not in the 2005 sample and is in the 2006 sample. Thus, the group quarters population should be excluded from all your tabulations.

The following is a link from the Census Bureau , which provides information on comparing ACS data (between the census and ACS and/or across ACS years):

http://www.census.gov/acs/www/guidancefordatausers/comparingdata/

Annotated Resources:

Direct Links:

Related Question Groups: