PIAAC state and county estimates represent adults ages 16 to 74, whereas the OECD estimates and most of the NCES estimates represent adults ages 16 to 65. PIAAC national estimates are from either the 2012/14 or 2017 collection. PIAAC state and county data are from the combined 2012/2014/2017 national data collections whereas the U.S. Also, the average scores and proficiency levels for state and county estimates include literacy-related nonrespondents (adults whose English language skills were too low to participate in the study) whereas the PIAAC national estimates exclude them. PIAAC Skills Map are based on statistical models that use PIAAC survey data in conjunction with American Community Survey (ACS) data, whereas the PIAAC national estimates are based directly on the PIAAC survey data. National aggregates derived from the PIAAC state and county model-based estimates are not directly comparable to the PIAAC national estimates. For more information about the SAE techniques used in the development of these estimates, please refer to the SAE methodology report.ДЇor more detailed information on the state and county estimates, see the Frequently Asked Questions (FAQ) below.ДЇor more information about technique and the development of the Skills Map estimates, see the State and County Estimation Methodology Report. These state and county estimates are based on the combined PIAAC data collected in 2012, 2014, and 2017 and are produced using an advanced statistical method generally referred to as small area estimation (SAE). The ACS variables provide context for the estimates by presenting basic demographic characteristics for the state or county, such as educational attainment, race/ethnicity, nativity, employment status, and poverty level. To help users to better understand the results produced for each state or county, the Skills Map gives users access to selected demographic variables from the American Community Survey (ACS). It also allows users to compare the estimates for any two counties or any two states. The Skills Map allows users to compare the estimates of any county to those of the state it is in or to compare the estimates of any state to national estimates. the percentage of adults with high levels of proficiency (above 275 points).the percentage of adults with medium levels of proficiency (226вЂ“275 points) and.the percentage of adults with low levels of proficiency (below 226 points).the average score of adults in the state or county (based on the PIAAC scale of 0вЂ“500 points).The Skills Map reports estimates of adult skills as

Statsey level