Prasanta Chandra Mahalanobis,
who passed away on 28 June 1972, in Calcutta [now
Kolkata], was an Indian statistician who devised the Mahalanobis
distance and was instrumental in formulating India’s strategy for
industrialization in the Second Five-Year Plan (1956–61).
Born to an academically
oriented family, Mahalanobis pursued his early education in Calcutta (now
Kolkata). After graduating with honours in physics from Presidency
College, Calcutta, in 1912, he moved to England to study physics and mathematics
at the University of Cambridge. Just before Mahalanobis left the
university in 1915, he was introduced to statistics by one of his tutors.
When he returned to India, he accepted a temporary position teaching physics at
Presidency College, and he became a professor of physics there in 1922.
However, his interest in statistics had evolved into a serious academic
pursuit, and he applied statistical methods to problems in anthropology,
meteorology, and biology. On 17 December 1931, he established the Indian
Statistical Institute in Calcutta.
Mahalanobis devised a
measure of comparison between two data sets that is now known as
the Mahalanobis distance. He introduced innovative techniques for
conducting large-scale sample surveys and calculated acreages and crop yields
by using the method of random sampling. He devised a statistical method
called fractile graphical analysis, which could be used to compare the
socioeconomic conditions of different groups of people. He also applied
statistics to economic planning for flood control.
With the objective of
providing comprehensive socioeconomic statistics, Mahalanobis established
the National Sample Survey in 1950 and also set up the Central Statistical
Organization to coordinate statistical activities in India. He was also a
member of the Planning Commission of India from 1955 to 1967. The Planning
Commission’s Second Five-Year Plan encouraged the development of heavy industry
in India and relied on Mahalanobis’s mathematical description of the Indian
economy, which later became known as the Mahalanobis model.
Mahalanobis held several national and
international portfolios. He served as the chairman of the United Nations Sub-Commission
on Sampling from 1947 to 1951 and was appointed the honorary statistical
adviser to the government of India in 1949. For his pioneering work, he was
awarded the Padma Vibhushan, one of India’s highest honours, by the Indian
government in 1968.