Sam- Decennial Census and ACS are separate programs, separate datasets. (Decennial Census does not have "margins of error." Putatively, there is no error ;-) You can find a data dictionary for Census 2010 SF1 on Census's website http://2010.census.gov/news/doc/sf1_table_matrix_section.doc That document lists every table, every variable. And I'm pretty sure the variables, definitions, formats in the API service conform to this data dictionary. Hope that helps. Good luck, Todd Graham From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] On Behalf Of Ennis, Samuel Sent: Tuesday, August 14, 2012 12:00 PM To: ctpp-news(a)chrispy.net Subject: [CTPP] SF1 API variable IDs So I'm once again befuddled by the way the API handles variable IDs. I'm trying to retrieve data from table PCT20: "Group quarters population by group quarters type" from SF1. However the SF1 does not seem to follow the same variable formatting as the ACS 5-Year (it doesn't seem to use the _001E / _001M suffixes). In the example queries, the table "P001: total population" is retrieved using the ID 'P0010001'. Based on this I would've guessed that the 0001 designates the variable within the table in the same way that _001E does. However using this same style suffix on PCT20 results in an error. Does anyone know how these IDs are constructed? I haven't been able to find a variable list for SF1 that corresponds to this one<http://www.census.gov/developers/data/2010acs5_variables.xml>ml>. Thanks much, Sam Ennis ________________________________ This email is intended to be read only by the intended recipient. This email may be legally privileged or protected from disclosure by law. If you are not the intended recipient, any dissemination of this email or any attachments is strictly prohibited, and you should refrain from reading this email or examining any attachments. If you received this email in error, please notify the sender immediately and delete this email and any attachments.