Recovery of Ancillary Information*

The main upsurge of late Professor R. A. Fisher’s theory of Statistical Inference took place within a brief span of about 10 years (1920–30) after the first world war. It was during this period that Fisher came out with the brilliant and now famous notions of (a) likelihood, (b) fiducial probability, (c) information and intrinsic accuracy, (d) sufficiency and (e) ancillary statistics and recovery of information — concepts around which the superstructure of the theory is built.