Raghu Raj Bahadur was an Indian

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

 born mathematical statistician

Statistician

A statistician is someone who works with theoretical or applied statistics. The profession exists in both the private and public sectors. The core of that work is to measure, interpret, and describe the world and human activity patterns within it...

 considered by peers to be "one of the architects of the modern theory of mathematical statistics". He published numerous papers and is best known for the concept of "Bahadur Efficiency".

The Anderson-Bahadur algorithm is used in statistics and engineering for solving binary classification problems when the underlying data have multivariate normal distributions with different covariance matrice

Covariance matrix

In probability theory and statistics, a covariance matrix is a matrix whose element in the i, j position is the covariance between the i th and j th elements of a random vector...

s. He was elected a Fellow of the American Academy of Arts and Sciences

American Academy of Arts and Sciences

The American Academy of Arts and Sciences is an independent policy research center that conducts multidisciplinary studies of complex and emerging problems. The Academy’s elected members are leaders in the academic disciplines, the arts, business, and public affairs.James Bowdoin, John Adams, and...

in 1986.