FPractice Formulas
Subjects / Geography

Geography

Statistics, hydrology, demography and location analysis.

14 formulas

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Statistical Tests

Spearman's rank (for ties-free data)

Correlation between two ranked variables.

In booklet

Nearest neighbour index

Nearest neighbour index

Hydrology & Discharge

Stream discharge

Discharge equals cross-section area times velocity.

Hydraulic radius

Cross-section area divided by wetted perimeter.

Bifurcation ratio

Bifurcation ratio

Demography

Population density

People per unit area.

Crude birth rate

Crude birth rate

In booklet

Crude death rate

Crude death rate

In booklet

Natural increase rate

NIR (‰) equals CBR (‰) minus CDR (‰).

Doubling time (rule of 70)

Doubling time (rule of 70)

In booklet

Dependency ratio

Dependency ratio

Dry adiabatic lapse rate

Dry adiabatic lapse rate