Lexical Diversity Checker
Measure lexical diversity with length-corrected MATTR score.
MATTR uses a 50-word sliding window — more reliable than TTR across different text lengths.
What is Lexical Diversity Checker?
Calculates lexical diversity using Moving Average Type-Token Ratio (MATTR) — a length-independent measure that gives consistent scores regardless of text length, unlike simple TTR. Useful for comparing texts of different lengths.
Common Use Cases
Comparing writing samples of different lengths, assessing language learner output, academic linguistics, author style comparison, and content quality analysis.
How It Works
Computes TTR in a sliding window of 50 words across the text and averages the results. This corrects for the length bias of simple TTR.
Frequently Asked Questions
How is MATTR different from TTR?
Simple TTR decreases as text gets longer, making comparisons unfair. MATTR uses a sliding window so scores are stable across different text lengths.
What window size is used?
A window of 50 words is used, which is standard for MATTR analysis.
Related Tools
Vocabulary Richness Score
Measure vocabulary diversity using Type-Token Ratio (TTR).
Unique Word Counter
Count unique words and see your vocabulary size.
Readability Score
Calculate Flesch Reading Ease score and grade level.
Most Frequent Words
Find the most commonly used words in your text.