1. Survival Equation

Continuity

The ratio of youth fluency to elder fluency. This tells us whether Kifuliiru is being successfully passed from one generation to the next. This is the earliest warning sign of language health.

S = \frac{V _{y}}{V _{e}} \times T

Variables

Symbol	Description
`S`	Survival score (0 to 1+)
`V_y`	Youth fluency rate (ages 5-25)
`V_e`	Elder fluency rate (ages 60+)
`T`	Time normalization factor (usually 1.0)

Worked example

Scenario 1
Worked example
DatasetMath steps
Scenario
Using the sample Kifuliiru field values below, compute Survival Equation.
Input data
Illustrative inputs
Quantity Symbol Value
Survival score (0 to 1+) S 0.55
Youth fluency rate (ages 5-25) V_y 0.63
Elder fluency rate (ages 60+) V_e 0.71
Time normalization factor (usually 1.0) T 1
Reasoning
Use the listed values (S = 0.55, V_y = 0.63, V_e = 0.71, T = 1) in the formula. The computed result is approximately 0.887. Interpret that value against the formula's stated purpose before using it in a report.
$Computation S = \frac{V _{y}}{V _{e}} \times T Result \approx 0.887$

Quantity	Symbol	Value
Survival score (0 to 1+)	S	0.55
Youth fluency rate (ages 5-25)	V_y	0.63
Elder fluency rate (ages 60+)	V_e	0.71
Time normalization factor (usually 1.0)	T	1

Playground

Test this formula with sample values and interactive charts.

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