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-X PACIFIC AERONAUTICAL LIBRARY 6715 Hollywood Boulevard GLadstone 5686 This publication may be kept two weeks and may be renewed for two more weeks if there are no other requests waiting for it PLEASE RETURN PROMPTLY Date due Date due JBTT l^(r OCT lA JUNl SEP 1 1 1943 m KC 16 DEC 30 Wt jUp 2 7 ^**> JAN 19 t9tt APR *J~ AI6 31 I94e mi2m PACIFIC AERONAUTICAL LIBRARY 6715 Kol lywood Boulevard GLadstone 5686 This publication may be kept two weeks and may be renewed for two more weeks If there are no other requests waiting for it. PLEASE RETURN PROMPTLY Date due Date due AW 4 1943 THE CONSTRUCTION OF MORTALITY AND SICKNESS TABLES w J By THE SAME AUTHORS A PRIMER OF STATISTICS. By W. Palin Elderton and Ethel M. Elderton. Third Edition. Crown8vo, cloth. Priceis. 6d. net. PublishedbyA.&C.Black. FREQUENCYCURVESAND COR- RELATION. ByW. Palin Elderton. PublishedbyC.&E.Layton,1906. MORTALITY OF THE TUBER- CULOUS & SANATORIUM TREAT- MENT. By W. Palin Elderton and Sidney Perry. J. PublishedbyDulau&Co. MORTALITY OF THE TUBER- CULOUS SANATORIUM&TUBER- CULIN T:REATMENT. ByW.Palin EldertonandSidney Perry. J. PublishedbyDulau&Co.,1913. AGENTS AMBRIOA THEMACMILLANCOMPANY 64&66FIFTHAVENUE, NEWYORK AUSTRALASIA OXFORDUNIVERSITYPRESS 205FlindersLane, Melbourne CANADA THE MACMILLANCOMPANYOF CANADA, LTD. ST. Martin'sHouse,70Bondstreet,Toronto INSIA MACMILLAN&COMPANY, LTD. . MACMILLAN BUILDING, BOMBAY 309BowBAZAARStreet,Calcutta THE CONSTRUCTION OF MORTALITY AND SICKNESS TABLES A PRIMER BY W. PALIN ELDERTON AND RICHARD FIPPARD C. FELLOWS OF THE INSTITUTE OF ACTUARIES LONDON ADAM AND CHARLES BLACK 1914 1) ^s^i^. » «« • •• • PREFACE In the following pages we have attempted to describe, with as little technicality as possible, the usual methods of constructing mortality and similar tables. As this book is intended mainly for those who have little or no acquaintance with the subject, we have tried to explain each step verbally with the help of arithmetical examples, in order to avoid the introduc- tion of algebraical formul*. It seems to us that such formula are of little use in explaining the principles of the subject to beginners. We have tried to avoid debatable points, but we feel that in some directions the subject has not yet been advanced beyond the empirical stage. This is particularly true of the treatment of census data. Much work has been done in perfecting the details of the census methods, but their bases rest on very weak foundations, and it seems that until fuller and more accurate information is available the value of the assumptions at present made cannot be properly determined. PREFACE vi In conclusion, we desire to record our indebtedness to our friend J. A. Humphreys for many valuable suggestions. He most kindly offered to read the book again in proof, but his sudden death has de- prived us of this further help. W. P. E. February 1914. K. C. F.