The notebooks are partially filled, and contain calculations and notes under headings including:
- The relation between two variables;
- Calculation of regression co-efficients;
- Regression from a correlation grid;
- Spearman's rank correlation method;
- Significance of Correlation Coefficients;
- Standard Errors of Correlation Coefficients;
- Pooling correlations;
- Prediction of a criterion in terms of raw score;
- Maximising the reliability of a test;
- Selection of items;
- Estimating a true score from an observed score;
- Standardisation of tests using D N Lawley's Method;
- The Scaling of Teachers Marks;
- Notes regarding parallelograms;
- Notes regarding friction.