Model C — Adaptive Stopping Lexile App

Reading Lexile Assessment

Question bank JSON

No file loaded.

Student name *

Please enter the student's name before starting.

Grade band

Max questions

Schema: id (number), lexile (number), passage, question, options (array), answer (string).

Stopping rule (default)

Minimum questions before stopping: 10
Rolling std-dev window: 10 estimates
Stop when std-dev ≤ 25 (Lexile points)
Max questions: 30

Advanced Tuning

Enable adaptive stopping

Off by default: fixed 30 questions, no early stopping.

Min questions before stopping

Value: 10

Rolling window size (N)

Value: 10

Std-dev threshold to stop (L)

Value: 25

Early jump (Q1–5)

Value: 100L

Mid jump (Q6–10)

Value: 75L

Late jump (Q11+)

Value: 20L

Streak bonus (3-correct/3-incorrect)

Value: 20L

Fast threshold (sec)

Value: 60s

Slow threshold (sec)

Value: 150s

Question 1 of 20

100%

↕️

Timer

00:00

Passage will appear here.

Question will appear here.

🎉 Assessment Complete!

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Lexile Level

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Results

Student: —

Date: —

Questions used: —

Estimated Lexile: — —

Confidence (std dev): —

Duration: —

Lexile progression

Response time distribution

Question-by-question

Review

Certificate of Completion

Reading Lexile Assessment — Model C

Student: —

Estimated Lexile: — ±—L

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