A Brief Introduction to Biostatistics

(C. Jardin) #1

Precision of statistical estimation



  • Width of a confidence interval gives a measure of the
    precision of the statistical estimation


 Estimation of population value can achieve higher
precision by minimizing S.E. , which depends on the
population s.d. and sample size, that is S.E. can be
minimized by maximizing sample size (up to a certain point)


X 1.96S.E.^ X X+1.96S.E.^

Low precision estimation

X X

X 1.96S.E.^ X X+1.96S.E.^

high precision estimation

X X

X
X
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