2.1 Introduction2.2 The Exact Least Squares Solution with Complete Data2.3 The Correct Least Squares Analysis with Missing Data2.4 Filling in Least Squares Estimates2.5 Bartlett's ANCOVA Method2.6 Least Squares Estimates of Missing Values by ANCOVA Using Only Complete-Data Methods2.7 Correct Least Squares Estimates of Standard Errors and One Degree of Freedom Sums of Squares2.8 Correct Least-Squares Sums of Squares with More Than One Degree of FreedomProblems