Ehrhardt, J.J.

happiness nation difference model life-satisfaction student theory dispersion stability correlation population error veenhoven cross-national pattern assumption prediction effect country pattern level component result people change satisfaction cross-national study table measurement error livability-theory ehrhardt society 1.00 folklore-theory life satisfaction condition comparison-theory quality measurement inequality variance question comparison scale scheme panel sample research university similarity indicators research degree indicator analysis range world stock experience population samples correspondence citizen component model figure variation survey equilibrium model variant outlook coefficient university students correlation matrix overtime estimate overtime correlations comparison theory matrix press instance appendix score