Happiness or subjective well-beinghow the various cognitive life evaluations and emotional reports are often called, can be measured by a number of instruments.For  practical  applications,  comparisons  of  the OLS  estimator -treating  the  ordinal  survey  indicators  as  cardinal  measures -with  traditional estimators for ordinal data were helpful in simplifying many analyses (Ferrer-i-Carbonell and Frijters 2004)