iah ICD category: E ICD class: A-B ICD class: C-D ICD class: D ICD class: f ICD class: G ICD class: H ICD class: J ICD class: K ICD class: L ICD class: M ICD class: N ICD class: R ICD class: S-T idea ideal ideas ideate Identity identity ideological Ideological connotations of the term "happiness" Ideological consumption ideology idiosyncratic idle idol Ikigai inventory ill Illegal settlers Illness illness image imagination imagine immigrant immigrants Immigrants in region immigration Immigration in vicinity Immune function immunization implied import importance Importance of goals improve Impulse buying impulsive Impulsive (vs inhibited) Imputation of missing cases inability to feel pleasure inaccuracy In age groups in between job inborn Inborn dispositions incarnated In children Income income Income aspirations Income change Income difference in region Income difference in vicinity Income in neighborhood income insurance income progress income support In compensatory education program indebting) independence independent index index of positive mental health indicator Indicators of hedonic level in animals Indicators of public mood in ' Big Data' indigenous individual Individual circumstances Individualism Individualism/collectivism in nation Individualism values individuality Individual life events Indoor green in education In elderly people inequality Inequality-adjusted happiness Inequality between sexes (women emancipation) in nation Inequality in happiness Inequality in social prestige in nation Inequality in the nation Inequality of happiness inequality of happiness in couple Inequality of happiness in nation Inequality of happiness in nations Inequality of happiness in parts of the world Inequality of happiness in publics Inequality of happiness in regions Inequality of incomes in nation inequality of opportunities in nation inequity infancy infant Infants infection Infectious and parasitic diseases inference Inference on the basis of biomarkers Inference on the basis of observed behavior inferred Inferred happiness infertile Infertility infertility Infertitily infirmity inflammation inflated self inflated self-esteem inflation Inflation in nation influence influx information information about happiness information seeking Informing about effects of choice on one's happiness Informing about effects on happiness infrastructure ingroup outgroup initiative In middle aged people innate inner Inner conditions inner control belief inner control orientation inner evaluation inner experience inner locus of control innoculation innovation Innovation in nation inpatient In publics in nations insane insight insomia insomnia instability Instititional change institutes Institutional living institutional living Institutional quality in region institutions instruction pc instructor Instrumental use Instrumental variable analysis Integrate appraisals integration Integration of minorities intellectual intellectuals intellectual tradition intelligence intelligence quotient intentional harm interaction Intercorrelations between happiness indicators interest interested interest in Interest in happiness Interests interests intergenerational inter generational contact internal Internal consistency of set internal experienced Internally controled (vs externally) internal migration international convergence international isolation international migration international student International trade by nation Internet internet Internet access Internet addiction Internet penetration in nation Internet proficiency Internet training interpersonal interpersonal comparison interpretation interrogation effect Inter sex interventions Interviewer bias intestines In the future In the past In the present intimacy intimate Intimate environment Intimate environment in childhood Intimate network intimate network Intimates left in home country intragenerational in treatment intrinsic Intrinsic motivation introspection introvert intuitive invalid invention inventions Inventors inventory investment in schooling Involuntary childless involved involved life Involvement involvement Involvement in global society of nation Involvement in war of nation In what conditions the most stable? In workforce (vs not) In young adults iphone IQ IQ in nation Is happiness a trait? Is happiness feasible? Is happiness not too relative? Is happiness something good in itself (a virtue)? Is happiness sufficiently stable? Is happiness the final end? Islam views on happiness Is lasting happiness possible? Isn't experiential happiness 'false' happiness? isolated isolation Is pursuit of happiness self-defeating? Is stability better than instability? issue issues