“onthemap” the census bureau’s new tool for residence-workplace analysis fredrik andersson and...
TRANSCRIPT
![Page 1: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/1.jpg)
“OnTheMap” The Census Bureau’s New Tool
for Residence-Workplace Analysis
Fredrik Andersson and Jeremy WuMay 7, 2007
Daytona Beach, FL
![Page 2: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/2.jpg)
Overview of Presentation
1. Live demo of OnTheMap (Jeremy)2. The Disclosure Avoidance Protocol
for OnTheMap (Fredrik)3. Analytical validity and
confidentiality protection (Fredrik)4. Data Access (Fredrik)
![Page 3: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/3.jpg)
1. Demonstration of OnTheMap
![Page 4: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/4.jpg)
![Page 5: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/5.jpg)
![Page 6: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/6.jpg)
![Page 7: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/7.jpg)
www.census.gov (Local Employment Dynamics) (Local Employment Dynamics)http://lehd.did.census.gov
![Page 8: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/8.jpg)
On The Map v.1LEHD’s online dynamic
mapping tool
On The Map v.1LEHD’s online dynamic
mapping tool
17 states online Completed 12/06
Where do workers live? Where do people work? Companion reports on
age, earnings, and industry
First partial synthetic data product
User select areas Block is base unit for
display; block group is base unit for report
Modular geographic layers such as community colleges and zip codes
![Page 9: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/9.jpg)
Optional Layers
![Page 10: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/10.jpg)
Where are Workers Residing in Sausalito, CA Employed?
![Page 11: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/11.jpg)
Concentric Circle Report
![Page 12: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/12.jpg)
On The Map Version 2On The Map Version 2
• Up to 44 LED partner states• Add 2004 data to 2002-2003 data• Cross-state patterns for all states• Enhanced multi-year reports• Additional geographies• Will become available in phases between
April and September 2007
![Page 13: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/13.jpg)
2. The Disclosure Avoidance Protocol for OnTheMap
![Page 14: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/14.jpg)
The Challenge: Maximize Analytical Validity of Data Subject to Strict Confidentiality Protection Constraints
Ana
lyti
cal V
alid
ity
of D
ata
Degree of confidentiality protection
Synthetic Data
Cell Suppressio
n
![Page 15: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/15.jpg)
Basic Facts about the Disclosure Protection System for OnTheMapGoal: “to protect confidentiality while preserving
analytical validity of data”– No cell suppression– Synthetic place of residence data – Workplace data protected by QWI disclosure
protection system (“dynamically consistent noise infusion”)
First-ever data product released by a Statistical Agency (Feb 2006) that relies on synthetic data method as its primary disclosure avoidance technique
![Page 16: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/16.jpg)
Disclosure Avoidance
Bayesian statistical techniques to create a partially synthetic version of the confidential data– Block of origin counts sampled from a
posterior predictive distribution conditional on destination block and worker characteristics (earnings, industry, age, ownership sector)
– The posterior predictive distribution is derived from combining the likelihood (“true data”) with a prior
So, what does this really mean???
![Page 17: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/17.jpg)
Creation of Synthetic Data
0%5%
10%15%20%25%30%35%40%45%50%
A B C D
Home Block
Likelihood Distribution
Prior Distribution
PPD for large population
PPD for small population
Fictional example: Distribution of place of residence for workers in a specific block, industry, earnings category, age category, ownership sector
Q: Why not sample directly from the likelihood/What’s the role of a prior?Q: How are the priors constructed?Q: How much weight is given to the prior?
![Page 18: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/18.jpg)
Key Implication
The relative weight of the prior when sampling from the posterior distribution is inversely related to the size of the population being synthesized– For larger populations the synthetic place of residence
data closely mimic underlying data– For small populations the synthetic place of residence
data are relatively more “noisy” to protect confidentiality
Important to keep in mind when making inferences using OnTheMap
How “noisy” an estimate is can be assessed by taking advantage of all 10 implicates of the synthetic data available on the virtual RDC
![Page 19: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/19.jpg)
3. Analytical Validity & Confidentiality Protection
![Page 20: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/20.jpg)
The residence patterns in synthetic data mimic confidential data well
![Page 21: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/21.jpg)
Level of protection increases as population in work block decreases
![Page 22: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/22.jpg)
Key Properties in data, such as commute distance, are preserved in synthetic data
![Page 23: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/23.jpg)
4. Data Access
![Page 24: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/24.jpg)
OnTheMap Data
------------------ (public use data) ------------------- • Origin-Destination (OD) matrix• Residence Area Characteristics• Workplace Area Characteristics• Quarterly Workforce Indicators (QWI)--------------- (below not distributed) ---------------• TIGER files• Geographic shape files, etc.
![Page 25: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/25.jpg)
OnTheMap Data
• There are 10 implicates; only the first is used in OnTheMap at this time
• 2002-2004• OnTheMap v2 for 17 states to be released
May 31 – these and future data to be made available within 6 weeks of release
• OnTheMap v1 data will be withdrawn in June
![Page 26: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/26.jpg)
Cornell CISER Site
http://vrdc.ciser.cornell.edu/onthemap/doc/
• No project approval needed
• Email [email protected] to register
• Read documentation and descriptions
• Very limited support
• Not affiliated with the Census Bureau
![Page 27: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/27.jpg)
Getting Your Feedback
Join the OnTheMap listserv:
http://lists.census.gov/mailman/listinfo/lehd-onthemap
Or send an email with Yes in the subject line to
![Page 28: “OnTheMap” The Census Bureau’s New Tool for Residence-Workplace Analysis Fredrik Andersson and Jeremy Wu May 7, 2007 Daytona Beach, FL](https://reader036.vdocuments.mx/reader036/viewer/2022070323/56649dbf5503460f94ab4066/html5/thumbnails/28.jpg)
Contact Us
Program [email protected]
General Comments/[email protected]
Websitehttp://www.census.gov (Local Employment Dynamics)
http://lehd.did.census.gov