Session-retention score

Read the equation

Subtracts the fraction of dropped sessions from one. If drops count distinct sessions from the same population, the result is a retention fraction between zero and one.

Terms & definitions

The recovered passage does not supply a separate symbol table. Read the source context for the notation used in this version; familiar letters may carry different meanings in other builds.

How it works

1. Read SS as the quantity being defined or updated by this relation.

2. Forms a ratio or division. A zero denominator needs an explicit exclusion or handling rule.

3. Use this version’s variable definitions and update order. The same symbol may be assigned a different meaning in another build.

Assumptions & limits

Source recovery establishes that the expression appears in this record. Its mathematical validity, implementation behavior, and interpretation must be assessed separately. See the linked source and research notes for the checks available for this version.

Original context

Layer 5 — Session Layer (N5)

Session state, handshake, continuity.
1.	Session Stability:
SS = 1 - \frac{N_{\text{drops}}}{N_{\text{sessions}}}
2.	Session Entropy:
SE = -\sum p_i \log p_i
3.	Cost:
\text{Cost}_5 = a_5 (1-SS) + b_5 SE

⸻

SS = 1 - \frac{N_{\text{drops}}}{N_{\text{sessions}}}

Related builds