Answer the question at the end by quoting:

Usher was born in Dallas, Texas, the son of Jonetta Patton (nee O'Neal), from Tennessee, and Usher Raymond III. Usher spent the majority of his young life in Chattanooga: his father left the family when Usher was a year old. Usher grew up with his mother, then-stepfather, and half-brother, James Lackey (born 1984). Directed by his mother, Usher joined the local church youth choir in Chattanooga, when he was nine years old.
On October 16, 2015, Usher released an interactive music video exclusively on the music streaming platform Tidal called "Chains" that featuring artist Nas and Bibi Bourelly. "Chains" literally forces the viewer to confront the issue of racial profiling and police brutality head-on: By utilizing the webcam on the viewer's computer as well as facial recognition technology, "Chains" paused mid-song whenever the viewer's eyes deviate from the video. Usher performed the song for the first time at the Tidal X:1020 concert on October 20, 2015, at Brooklyn's Barclays Arena. On January 14, 2016, after continual delays of his eighth album, Usher announced via Daniel Arsham Instagram post that he changed the title of the album from UR to Flawed. It was scheduled to be released in April 2016, but has been pushed back with no release date. On June 9, 2016, Usher released a new single from his expected forthcoming album Flawed on the music streaming platform Tidal titled "No Limit" featuring Young Thug, along with a second single titled "Crash" on June 10 for all digital platforms.  On June 12, 2016, it was reported that Raymond signed a management deal with business partner Scooter Braun. Braun already represented Justin Bieber and had a joint venture with Raymond and Bieber. This report was confirmed by Usher during a sit down interview with Ryan Seacrest at the 73rd annual Cannes Festival on June 21, 2016. Usher furthered his acting career, starring as American former professional boxer Sugar Ray Leonard in the 2016 American-Panamanian biographical sports film Hands of Stone about the career of Panamanian former professional boxer Roberto Duran. In it, he starred opposite of Edgar Ramirez, Robert De Niro and Ruben Blades. On August 26, 2016, Hands of Stone premiered worldwide. "Missin U" was also released as a third single by RCA Records for online streaming and digital download, along with "Champions (from the Motion Picture Hands of Stone)", both on Vevo. On August 30, "Rivals" featuring Future was released and debuted exclusively on Tidal with its accompanying video. It was released on Vevo on September 2, 2016. On September 13, 2016, both "Missin U" and "Rivals" were sent to radio as the album's third and fourth singles.  The album Hard II Love was released on September 16, 2016, and received generally positive reviews from contemporary music critics. It debuted at number 5 on the US Billboard 200, and sold 28,000 copies in the United States in its first week. It also became his seventh consecutive top ten album in the United States. The lead single, "No Limit" featuring rapper Young Thug initially was serviced to Urban radio on June 9, and eventually peaked at number 32 on the Billboard Hot 100, and number 9 on the Hot R&B/Hip-Hop Songs.

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"Chains" literally forces the viewer to confront the issue of racial profiling and police brutality head-on:

IN: Raymond Bernard Cattell (20 March 1905 - 2 February 1998) was a British and American psychologist, known for his psychometric research into intrapersonal psychological structure. His work also explored the basic dimensions of personality and temperament, the range of cognitive abilities, the dynamic dimensions of motivation and emotion, the clinical dimensions of abnormal personality, patterns of group syntality and social behavior, applications of personality research to psychotherapy and learning theory, predictors of creativity and achievement, and many multivariate research methods including the refinement of factor analytic methods for exploring and measuring these domains. Cattell authored, co-authored, or edited almost 60 scholarly books, more than 500 research articles, and over 30 standardized psychometric tests, questionnaires, and rating scales. According to a widely cited ranking, Cattell was the 16th most eminent, 7th most cited in the scientific journal literature, and among the most productive, but controversial psychologists of the 20th century.

Cattell noted that in the hard sciences such as chemistry, physics, astronomy, as well as in medical science, unsubstantiated theories were historically widespread until new instruments were developed to improve scientific observation and measurement. In the 1920s, Cattell worked with Charles Spearman who was developing the new statistical technique of factor analysis in his effort to understand the basic dimensions and structure of human abilities. Factor analysis became a powerful tool to help uncover the basic dimensions underlying a confusing array of surface variables within a particular domain.  Factor analysis was built upon the earlier development of the correlation coefficient, which provides a numerical estimate of the degree to which variables are "co-related". For example, if "frequency of exercise" and "blood pressure level" were measured on a large group of people, then intercorrelating these two variables would provide a quantitative estimate of the degree to which "exercise" and "blood pressure" are directly related to each other. Factor analysis performs complex calculations on the correlation coefficients among the variables within a particular domain (such as cognitive ability or personality trait constructs) to determine the basic, unitary factors underlying the particular domain.  While working at the University of London with Spearman exploring the number and nature of human abilities, Cattell postulated that factor analysis could be applied to other areas beyond the domain of abilities. In particular, Cattell was interested in exploring the basic taxonomic dimensions and structure of human personality. He believed that if exploratory factor analysis were applied to a wide range of measures of interpersonal functioning, the basic dimensions within the domain of social behavior could be identified. Thus, factor analysis could be used to discover the fundamental dimensions underlying the large number of surface behaviors, thereby facilitating more effective research.  As noted above, Cattell made many important innovative contributions to factor analytic methodology, including the Scree Test to estimate the optimal number of factors to extract, the "Procrustes" oblique rotation strategy, the Coefficient of Profile Similarity, P-technique factor analysis, dR-technique factor analysis, the Taxonome program, as well the Rotoplot program for attaining maximum simple structure solutions. In addition, many eminent researchers received their grounding in factor analytic methodology under the guidance of Cattell, including Richard Gorsuch, an authority on exploratory factor analytic methods.

What other information do we have on the functionality of Factor analysis?

OUT:
Factor analysis was built upon the earlier development of the correlation coefficient, which provides a numerical estimate of the degree to which variables