CONTENTS 



MEASUREMENTS OF TYPE AND VARIABILITY 



1. The Comparative Accuracy of the Average and the Median 1 



2. The Comparative Accuracy of the Mean Square Deviation and the 



Average Deviation 5 



3. The Divergencies of the Obtained from the True Measures by 



Theory and by Experiment 8 



4. The Relation between the Amount of a Central Tendency and 

 the Amount of the Variability of the Group about the Cen- 

 tral Tendency 9 



MEASUREMENTS OF RELATIONSHIPS 



5. The Meaning of Typical Measures of Relationship 15 



6. The Presuppositions of Measures of Relationship 25 



7. The Advantages of the Different Measures 25 



8. The Attenuation of Measurements of Relationship 35 



9. Minor Advice to Students of Mental and Social Relationships ... 41 



