Vocabulary Size Estimation (Nation's Test)

Estimate total vocabulary size from performance on Nation's Vocabulary Levels Test (VLT). Based on performance at 2,000, 3,000, 5,000, 10,000 word frequency bands. Native English speaker adult vocabulary averages 20,000–35,000 word families.

Data set — comma or newline separated
Statistical Results — n = 8
Count (n)8
Sum (Σx)40
Min2
Max9
Range7
Q14
Q35.5
IQR1.5
Mean (μ)5
Median4.5
Mode4
Pop. Variance (σ²)4
Pop. Std Dev (σ)2
Sample Variance (s²)4.571428571
Sample Std Dev (s)2.138089935
Skewness0.65625
Excess Kurtosis-0.21875
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How It Works

Estimate total vocabulary size from performance on Nation's Vocabulary Levels Test (VLT). Based on performance at 2,000, 3,000, 5,000, 10,000 word frequency bands. Native English speaker adult vocabulary averages 20,000–35,000 word families

Each component has a specific meaning:

  • Performance on Nation's Vocabulary Levels Test — The performance on nation's vocabulary levels test recorded for the scenario being assessed.

Note: Interpret the vocabulary size test result against the thresholds and context described above.

How to Use

Enter the performance on Nation's Vocabulary Levels Test for the scenario you are assessing. Estimate total vocabulary size from performance on Nation's Vocabulary Levels Test (VLT). Based on performance at 2,000, 3,000, 5,000, 10,000 word frequency bands. Native English speaker adult vocabulary averages 20,000–35,000 word families. Use the vocabulary size test result to inform your calculation.

Frequently Asked Questions