Numerous studies have explored the different components of religiosity, with most finding some distinction between religious beliefs/doctrine, religious practice, and spirituality. When religiosity is measured, it is important to specify which aspects of religiosity are referred to. The 2008 American Religious Identification Survey (ARIS) found a difference between how people identify and what people believe. While only 0.7% of U.S. adults identified as atheist, 2.3% said there is no such thing as a god. Only 0.9% identified as agnostic, but 10.0% said there is either no way to know if a god exists or they weren't sure. Another 12.1% said there is a higher power but no personal god. In total, only 15.0% identified as Nones or No Religion, but 24.4% did not believe in the traditional concept of a personal god. The conductors of the study concluded, "The historic reluctance of Americans to self-identify in this manner or use these terms seems to have diminished. Nevertheless ... the level of under-reporting of these theological labels is still significant ... many millions do not subscribe fully to the theology of the groups with which they identify." Similarly, the 2012 Pew study reported that 23% of Americans who affiliated with a religion were not religious. The religiously affiliated were 79% of the population, and the unaffiliated were 19.6%, including 6% "atheist" or "agnostic". Existing nationally representative polls such as Pew and Gallup indicate atheist prevalence is relatively low (3% -11%) in the United States, however, in one study using validated unmatched counting interviewing technique, in which people did not need to "admit" explicitly to a certain position, the number of people who did not believe in a god was indirectly estimated to be 26% overall. The authors noted that 26% of Baby boomers and millennials did not have belief in a god. According to a Pew study in 2009, only 5% of the total US population did not have a belief in a god. Out of all those without a belief in a god, only 24% self-identified as "atheist", while 15% self-identified as "agnostic", 35% self-identified as "nothing in particular", and 24% identified with a religious tradition. According to a Gallup's editor in chief, Frank Newport, numbers on surveys may not be the whole story. In his view, declines in religious affiliation or declines in belief in God on surveys may not actually reflect an actual decline in these beliefs among people since increased honesty on spiritual matters to interviewers may merely be increasing since people may feel more comfortable today expressing viewpoints that were previously deviant.