In this task, you are given a set of context paragraph and some supporting facts to answer a question. Your task is to generate answer for given question based on set of context paragraphs and supporting facts.
Q: Context_1 : Albert Hosmer Bowker (September 8, 1919 January 20, 2008) was an American statistician and university administrator. Born in Massachusetts, he worked at Stanford University in the late 1940s to early 1950s. In 1953 he was elected as a Fellow of the American Statistical Association. He then served as Chancellor of the City University of New York from 1963 to 1971. During this period, in 1964, he married his second wife, Rosedith Sitgreaves, herself a notable statistician who had gone through the graduate program in statistics at Columbia University with Bowker and was at the time a professor at Columbia. He served as Chancellor of the University of California, Berkeley from 1971 to 1980 until serving as U.S. Assistant Secretary for Post-Secondary Education in the Carter administration. After 1 year, he went to the University of Maryland to serve as Dean of the School of Public Affairs. He died of pancreatic cancer in 2008. Context_2 : Nathaniel Read Silver (born January 13, 1978) is an American statistician and writer who analyzes baseball (see sabermetrics) and elections (see psephology). He is the editor-in-chief of ESPN's "FiveThirtyEight" and a Special Correspondent for ABC News. Silver first gained public recognition for developing PECOTA, a system for forecasting the performance and career development of Major League Baseball players, which he sold to and then managed for Baseball Prospectus from 2003 to 2009. Context_3 : Christopher Bingham is an American statistician who introduced the Bingham distribution. In joint work with C.M.D.Godfrey and John Tukey he introduced complex demodulation into the analysis of time series. The Kent distribution is also known as the FisherBingham distribution, is named after Bingham and the English biologist and statistician Ronald Fisher. Context_4 : Howard Steven Friedman (born June 10, 1972) is a prominent American statistician, health economist, writer and artist currently employed at the United Nations Population Fund (UNFPA) and as an adjunct Associate Professor at Columbia University Context_5 : Trevor John Hastie (born 27 June 1953) is an American statistician and computer scientist. He is currently serving as the John A. Overdeck Professor of Mathematical Sciences and Professor of Statistics at the Stanford University. Hastie is known for his contributions to applied statistics, especially in the field of machine learning, data mining, and bioinformatics. He has authored several popular books in statistical learning, including "The Elements of Statistical Learning: Data Mining, Inference, and Prediction". Hastie has been listed as an ISI Highly Cited Author in Mathematics by the ISI Web of Knowledge. Context_6 : George William James (born October 5, 1949) is an American baseball writer, historian, and statistician whose work has been widely influential. Since 1977, James has written more than two dozen books devoted to baseball history and statistics. His approach, which he termed sabermetrics in reference to the Society for American Baseball Research (SABR), scientifically analyzes and studies baseball, often through the use of statistical data, in an attempt to determine why teams win and lose. His "Baseball Abstract" books in the 1980s are the modern predecessor to websites using sabermetrics such as Baseball Prospectus and Baseball Primer (now Baseball Think Factory). Context_7 : Beardsley Ruml (5 November 1894 19 April 1960) was an American statistician, economist, philanthropist, planner, businessman and man of affairs in the 1920s, 1930s and 1940s. He was born in Cedar Rapids, Iowa. His father, Wentzle Ruml, was a country doctor. His mother, Salome Beardsley Ruml, was a hospital superintendent. He received a BA from Dartmouth College in 1915 and a Ph.D. in psychology and education from the University of Chicago in 1917. On August 28, 1917 he married Lois Treadwell; they had three children. A pioneer statistician, in 1918 he helped design aptitude and intelligence tests for the U.S. Army. Ruml viewed society as composed of groups whose traits could be measured and ranked on a scale of normality and deviance. Context_8 : Dave Leip's Atlas of U.S. Presidential Elections is a web site that provides tables, graphs, and maps for presidential (1789present), senatorial (1990 and onwards), and gubernatorial (1990 and onwards) elections. Data include candidates, parties, popular and electoral vote totals, and voter turnout. County-level data is available for many years, and all data are compiled from official sources. Leip's Atlas has been cited as a "preferred source for election results" by statistician and political pundit Nate Silver. Context_9 : David L. Banks is an American statistician. He is a former editor of the "Journal of the American Statistical Association"; a founding editor of "Statistics, Politics and Policy"; and a co-editor of the monograph "Statistical Methods for Human Rights". He is a fellow of the Institute of Mathematical Statistics and the Royal Statistical Society. He has been a member of the Board of Directors of the American Statistical Association, and he is a past-President of the Classification Society. He has taught at the University of Cambridge and at Carnegie Mellon University; he was also Chief Statistician of the U.S. Department of Transportation. Additionally, he has served on six National Academies panels. Context_10 : Katherine K. Wallman is an American statistician who was the Chief Statistician of the United States from 1992 to 2017. In that role at the U.S. Office of Management and Budget, she provided coordination, guidance, and oversight for the Federal Statistical System of the United States. fact_1 : Leip's Atlas has been cited as a "preferred source for election results" by statistician and political pundit Nate Silver. fact_2 : Nathaniel Read Silver (born January 13, 1978) is an American statistician and writer who analyzes baseball (see sabermetrics) and elections (see psephology). Question: An American statistician and writer who analyzes baseball cited Leip's Atlas as what?
A:
preferred source for election results