Principles of Medical Statistics

age at death age-groups arisen by chance arithmetic mean average births calculated cancer causes characteristics coefficient of variation column compared comparison County Boroughs crude rates deaths registered difference disease due to chance England and Wales equal example expected number expected values factors Fallopian tube fatality-rate figures frequency distribution give given grand mean height hospital inches inoculated instance intelligence group large number lived measles measure median merely by chance minus mortality number of children number of deaths number of observations number of patients number of persons nutrition occur by chance overcrowding percentage pernicious anaemia proportion ratio real mean real units recover relatively respiratory tuberculosis round Rural Districts serum squared deviations standard deviation standard error standard population standardised death-rate standardised rates statistical method stature Table taken tion total number treated true mean tuberculosis twice the standard uninoculated universe variability worker