Data Releases & Methodology by Year
Following the practice of the U.S. Census Bureau, each year IECAM demographers prepare a “data release” that includes the new data for the most recently available year plus updated data for the previous several years. Each year’s release is slightly more accurate than the previous year. The five-year span is based on IECAM’s use of the 5-year ACS (American Community Survey) as one of its principal demographic data sources.

Thus the label “2013 Data Release” means “first time release of demographic data for 2013.” The history of IECAM’s data releases is as follows:

As the list indicates, data for a given year are released two years after the data year.

Note that the names of the data releases listed on this page were changed in July 2014. Previously, IECAM had named the release after the year in which the data were released, rather than the year of the data themselves. For example, the 2011 release which reports data for 2011 in year 2013 was formerly called the 2013 release. The new naming convention is more in keeping with the naming conventions of the Census Bureau.

Data Availability
Besides its data on early care and education services in the state of Illinois, IECAM provides demographic data on population, poverty, language, and working families. These demographic data in IECAM include estimates for each year beginning with 2005 (corresponding to Fiscal Year 2006, the first year for which IECAM reported early care and education data) based on U.S. Census Bureau data products.

  • Table 1. IECAM Data: Availability of data types by year
    This table lists what data types (early care and education services; demographics) are available on IECAM, and what years are available for those data types.
  • Table 2. IECAM Data: Data types displayed by year
    When you select a year while searching for data on IECAM, the search results for each data type display the most recent year’s data up to the selected year. This may not be the same as the year you selected. (For example, you might select the year 2015, but the most recent data on population might be for 2014.) This table indicates what data year is available when you select a display year for a given data type.
  • Table 3. IECAM Data: Data available by geographic region
    This table tells you what geographic regions are available for each data type on IECAM.
  • Table 4. IECAM Data: Additional data available beyond the online database
    Data available on IECAM outside the online database, especially in the Risk Factors section of the Web site.

The estimates for all years from the latest release are available in IECAM’s publicly searchable database.

Data by Geographic Region by Year

 

The changing map of Illinois

For the first several years of the project, IECAM used the same map of Illinois in its online database. Beginning with the early care and education data for FY2011 and the demographic data for 2009, IECAM modified its online database and GIS map pages to use a different map each year.

The reason for this is simply that—although most residents may not be aware of this—the map of the state of Illinois changes every year. While the state as a whole does not change, every year there are a number of municipalities, townships, and school districts that are created, eliminated, merged, or split, or that change their name. And every 10 years, the district maps change for the state legislature and the federal congress. This latter change occurred with the 98th Illinois General Assembly and the 113th U.S. Congress that were seated in Springfield and Washington in 2013.

In the online database, search results present data for whatever areas exist, and only the areas that exist, in a selected year. Therefore, for example, if you’re searching by municipality for 2012 and a municipality was incorporated only in 2013, you will not find that municipality in the 2012 data. Another example: If you search for data in Monroe County by townships (called precincts in that county) in 2007 or 2008, you will find 27 precincts; if you search in 2009 or later, you’ll find 37 precincts in the county’s completely reorganized township structure.

What maps does IECAM use?

IECAM uses the TIGER maps from the U.S. Census Bureau. These maps are produced for every year and include any changes to geographic regions (townships, municipalities, school districts, etc.) for the year.

When does IECAM update its maps?

The Census Bureau typically produces its map for a year at the very end of the year. For example, the Census Bureau’s 2014 TIGER map was released near the end of 2014. However, the Census Bureau does not release all the data for small regions for a given year till much later. For example, some data for 2014 by township or municipality was not released until late in 2015 or early in 2016. When the data for a given year are released, then IECAM processes the data by the TIGER map for that year.

Why does IECAM not have data for the current year?

Concerning data on early care and education services, IECAM receives these data from the state agencies involved with those services. The data for a given fiscal year (FY) are received sometime during the following FY. Thus, data on early care and education services for a given FY (e.g., FY2015) typically appear in the IECAM online database near the end of the following FY (e.g., FY2016).

Concerning demographic data, as noted above, the Census Bureau releases its final and complete data for a given year between 1 and 2 years (depending on the geographic region) after the target year. For example, demographic data for 2014 appeared around the end of 2015 and beginning of 2016.


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