Fisher's ideal index is called 'ideal' primarily because it:
A. Satisfies both time reversal and factor reversal tests
B. Uses only current period data
C. Is the easiest to calculate
D. Ignores quantity changes
Answer: Option A
Solution (By JKSSB Mock Tests)
Fisher's index earns the 'ideal' label by mathematically satisfying two key consistency tests (time reversal and factor reversal), ensuring logical coherence in index number construction.
Explanation:
Per WHO definition, perinatal mortality includes late fetal deaths (stillbirths) from 28 completed weeks of gestation and early neonatal deaths (first 7 days), capturing risks around birth.
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