2. Language Vitality Index (LVI)

Continuity

A comprehensive "health score" for Kifuliiru that combines how many people speak it, where they use it, and how many generations are actively speaking it.

L V I = \frac{( P _{f} \cdot U _{d} ) + D _{g e n}}{P _{t o t}}

Variables

Symbol	Description
`LVI`	Language Vitality Index (0 to 1)
`P_f`	Fluent population count
`U_d`	Usage domains score (0-10)
`D_gen`	Generational depth (1-5)
`P_tot`	Total population of the community

Worked example

Scenario 1
Worked example
DatasetMath steps
Scenario
Using the sample Kifuliiru field values below, compute Language Vitality Index (LVI).
Input data
Illustrative inputs
Quantity Symbol Value
Language Vitality Index (0 to 1) LVI 0.55
Fluent population count P_f 150
Usage domains score (0-10) U_d 0.71
Generational depth (1-5) D_gen 0.79
Total population of the community P_tot 300
Reasoning
Use the listed values (LVI = 0.55, P_f = 150, U_d = 0.71, D_gen = 0.79, P_tot = 300) in the formula. The computed result is approximately 0.358. Interpret that value against the formula's stated purpose before using it in a report.
$Computation L V I = \frac{( P _{f} \cdot U _{d} ) + D _{g e n}}{P _{t o t}} Result \approx 0.358$

Quantity	Symbol	Value
Language Vitality Index (0 to 1)	LVI	0.55
Fluent population count	P_f	150
Usage domains score (0-10)	U_d	0.71
Generational depth (1-5)	D_gen	0.79
Total population of the community	P_tot	300

Playground

Test this formula with sample values and interactive charts.

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