Duration on unemployment:  geographic mobility and selectivity bias.
D000569:Americas; D015982:Bias; D003625:Data Collection; D003710:Demography; D019049:Developed Countries; D004467:Economics; D004641:Emigration and Immigration; D004651:Employment; D016015:Logistic Models; D008962:Models, Theoretical; D015999:Multivariate Analysis; D009656:North America; D011153:Population; D011157:Population Dynamics; D012107:Research Design; D012494:Sampling Studies; D013997:Time Factors; D014171:Transients and Migrants; D014478:Unemployment; D014481:United States
Americas; Bias; Comparative Studies; Demographic Factors; Developed Countries; Economic Factors; Employment; Error Sources; Labor Migration; Logistic Model; Macroeconomic Factors; Mathematical Model; Measurement; Migration; Models, Theoretical; Multivariate Analysis; North America; Northern America; Population; Population Dynamics; Research Report; Sampling Studies; Studies; Surveys; Time Factors; Unemployment; United States