| R | research method and research organization b-out d-out ah |
| RA | general topics in research d-out ah |
| RA2 | research in general ah |
| RA4 | definitions and theories ah |
| RA6 | paradigm ah |
| RA8 | interdisciplinary and multidisciplinary research ah |
| RA8.2 | . interdisciplinary research ah |
| RA8.4 | . multidisciplinary research ah |
| RA10e | research agenda ah |
| RA12e | research issue ah |
| RA14e | research outcome ah |
| RA14.4 | . generalizability of research results ah |
| RA14.6 | . policy implications of research ah |
| RA16e | scientific disagreement ah |
| RA18e | research quality ah |
| RA18.6e | . hierarchy of evidence ah |
| RA20e | research ethics ah |
| RA20.2 | . human subject protection ah |
| RA22e | research in practice ah |
| RB | research organization and management d-out ah |
| RB2 | research project management ah |
| RB2.2 | . collaborative study ah |
| RB4e | research funding ah |
| RB4.2 | . research funding source ah |
| RB4.4 | . research funding recipient ah |
| RB4.6 | . type of research funding ah |
| RB4.6.2 | . . research grants ah |
| RB6e | research dissemination ah |
| RB8 | research organization ah |
| RB8.2 | . research facility ah |
| RCe | research and evaluation method d-out ah |
| RD | type of research study d-out ah |
| RD2e | . empirical study ah |
| RD2.2e | . . statistical data ah |
| RD2.2.2e | . . . individual-level statistical data ah |
| RD2.2.4e | . . . aggregate-level statistical data ah |
| RD2.4 | . . experiment ah |
| RD2.4.2e | . . . trial study ah |
| RD2.4.2.2e | . . . . randomized controlled trial ah |
| RD2.4.2.2.2 | . . . . . confirmatory trial ah |
| RD2.4.2.2.4 | . . . . . replication trial ah |
| RD2.4.2.4e | . . . . controlled trial without randomization ah |
| RD2.4.2.6e | . . . . large-scale field trial ah |
| RD2.4.2.8e | . . . . prevention trial ah |
| RD2.4.2.10e | . . . . clinical trial ah |
| RD2.6 | . . quasi-experimental study ah |
| RD2.6.2e | . . . case-control study ah |
| RD2.8e | . . qualitative study ah |
| RD2.10e | . . survey ah |
| RD2.10.2e | . . . social survey ah |
| RD2.10.2.2 | . . . . general population survey ah |
| RD2.12e | . . case study ah |
| RD2.12.2e | . . . case history ah |
| RD4e | . theoretical study ah |
| RD6 | . study of one area, group, or program ah |
| RD8 | . research involving two or more groups ah |
| RD8.2e | . . comparative study ah |
| RD8.4e | . . cross-cultural study ah |
| RD10 | . research involving two or more studies ah |
| RD10.2e | . . survey of research ah |
| RD10.4e | . . meta-analysis ah |
| RD10.6e | . . cross-study comparability ah |
| RD10.8e | . . replication study ah |
| RE | environment of study d-out ah |
| RE2e | . laboratory study ah |
| RE2.2e | . . in vitro study ah |
| RE2.4e | . . in vivo study ah |
| RE4e | . field study ah |
| RE6e | . clinical study ah |
| RE8e | . forensic study ah |
| RE10e | . postmortem study ah |
| RF | purpose of study d-out ah |
| RF2 | . research and evaluation ah |
| RF2.2e | . . research ah |
| RF2.2.2 | . . . basic research ah |
| RF2.2.4e | . . . applied research ah |
| RF2.4e | . . validation study ah |
| RF2.6e | . . evaluation study ah |
| RF2.6.4e | . . . follow-up study ah |
| RF4e | . feasibility study ah |
| RF6e | . pilot study ah |
| RF8 | . explanation and prediction ah |
| RF8.2 | . . explanation ah |
| RG | time scope of study d-out ah |
| RG2 | . one-time and longitudinal study ah |
| RG2.2e | . . cross-sectional study ah |
| RG2.4e | . . longitudinal study ah |
| RG2.4.6e | . . . cohort study ah |
| RG4 | . retrospective study and prospective study ah |
| RG4.2e | . . retrospective study ah |
| RG4.4e | . . prospective study ah |
| RJ | study subject d-out ah |
| RJ2 | . chemical substance as study subject ah |
| RJ2.2 | . . laboratory biomolecule study ah |
| RJ4e | . histologic study ah |
| RJ4.2e | . . cell culture study ah |
| RJ6 | . nonhuman organism study ah |
| RJ6.2e | . . animal study ah |
| RJ6.2.2e | . . . animal model ah |
| RJ8e | . human study ah |
| RJ8.2e | . . individual as study subject ah |
| RJ8.2.2 | . . . family, adoption, or twin study ah |
| RJ8.2.2.2e | . . . . twin study ah |
| RJ8.2.2.4e | . . . . adoption study ah |
| RJ8.2.4e | . . . household survey ah |
| RJ8.4e | . . family study ah |
| RJ8.6e | . . group as study subject ah |
| RJ8.8e | . . organization as study subject ah |
| RJ8.10 | . . program as study subject ah |
| RK | study design, planning, execution, and result d-out ah |
| RK2e | . study design ah |
| RK2.2 | . . statistical study design ah |
| RK2.2.2 | . . . factorial design ah |
| RK2.4 | . . assignment of study subjects to conditions ah |
| RK2.6 | . . controlled vs uncontrolled study ah |
| RK2.6.2 | . . . assignment of subjects to study conditions ah |
| RK2.6.4e | . . . controlled study ah |
| RK2.6.4.2 | . . . . control variable ah |
| RK2.6.4.4 | . . . . control group ah |
| RK2.6.6 | . . . uncontrolled study ah |
| RK2.8 | . . blind and open study ah |
| RK2.8.2e | . . . blind study ah |
| RK2.8.2.2e | . . . . single-blind study ah |
| RK2.8.2.4e | . . . . double-blind study ah |
| RK2.10 | . . follow-up design ah |
| RK2.10.2 | . . . length of follow-up ah |
| RK4 | . study planning ah |
| RK6 | . study execution ah |
| RK8 | . study results ah |
| RK10e | . ecological fallacy ah |
| RLe | sample selection d-out ah |
| RL2e | . population study ah |
| RL4 | . sample by method of selection ah |
| RL4.2e | . . random sample ah |
| RL6 | . simple or stratified sample ah |
| RL6.2 | . . simple sample ah |
| RL6.4 | . . stratified sample ah |
| RL8 | . multistage sampling design ah |
| RL10e | . sample selection problems ah |
| RL10.2 | . . recruiting and enrolling subjects ah |
| RL10.4e | . . sampling bias ah |
| RL10.6 | . . sample attrition ah |
| RMe | variable, characteristic, factor d-out ah |
| RM2 | . integration of multiple types of measures ah |
| RM2.2 | . . multitrait-multimethod approach ah |
| RM4 | . indicator variable ah |
| RM6 | . definition of variables ah |
| RM6.2 | . . operational definition ah |
| RM6.4 | . . measurement scale ah |
| RM6.4.4 | . . . Likert scale ah |
| RM6.4.6e | . . . rating scale ah |
| RM8 | . objective vs subjective variables ah |
| RM8.2e | . . objective variables ah |
| RM8.4e | . . subjective variables ah |
| RM10 | . individual vs group variable ah |
| RM10.2 | . . individual-level variable ah |
| RM10.4 | . . group-level variable ah |
| RM12 | . microvariable and macrovariable ah |
| RM12.2 | . . microvariable ah |
| RM12.4 | . . macrovariable ah |
| RM14e | . predictive factor ah |
| RM16 | . latent variable ah |
| RM18e | . confounding variable ah |
| RM20 | . effect modifier ah |
| RM22e | . assessment of variables and methods ah |
| RM22.2e | . . accuracy of variables and methods ah |
| RM22.2.2 | . . . observer variation ah |
| RM22.4 | . . missing data problem ah |
| RM22.6 | . . reliability and validity (research methods) ah |
| RM22.6.2e | . . . reliability (research methods) ah |
| RM22.6.4e | . . . validity (research methods) ah |
| RM22.6.4.2 | . . . . face validity ah |
| RM22.6.4.4e | . . . . construct validity ah |
| RM22.6.4.6e | . . . . predictive validity ah |
| RM22.8e | . . specificity and sensitivity of measurement ah |
| RM22.8.2e | . . . specificity of measurement ah |
| RM22.8.4e | . . . sensitivity of measurement ah |
| RM22.10e | . . standardized test ah |
| RM22.12 | . . criterion-referenced test ah |
| RM24 | . statistical effects and errors ah |
| RM24.6e | . . statistical power ah |
| RM26e | . intermethod comparison ah |
| RPe | data collection d-out ah |
| RP2e | . study subject history ah |
| RP2.2e | . . study subject AODU history ah |
| RP4e | . measurement in general ah |
| RP6e | . laboratory measurement ah |
| RP8e | . test of body functioning ah |
| RP10e | . observation ah |
| RP10.2e | . . participant observation ah |
| RP12e | . data collection from mental responses ah |
| RP12.2e | . . specific data collection instrument ah |
| RP12.4e | . . self-report ah |
| RP12.6e | . . psychological or educational test ah |
| RP12.6.2 | . . . testing protocols ah |
| RP12.8 | . . questionnaire or interview ah |
| RP12.8.2 | . . . questionnaire or interview design ah |
| RP12.8.4e | . . . questionnaire ah |
| RP12.8.6e | . . . interview ah |
| RP12.8.6.2 | . . . . face-to-face interview ah |
| RP12.8.6.4 | . . . . telephone interview ah |
| RP12.8.6.6 | . . . . structured interview ah |
| RP12.8.6.8 | . . . . unstructured interview ah |
| RP14e | . data collection from documents ah |
| RP14.2e | . . content analysis ah |
| RP14.4 | . . specific data source ah |
| RP14.4.2 | . . . emergency room reports ah |
| RP14.4.4 | . . . hospital discharge data ah |
| RQe | data analysis method d-out ah |
| RQ2e | . description ah |
| RQ4 | . estimation ah |
| RQ4.2e | . . statistical estimation ah |
| RQ4.2.2e | . . . synthetic estimation ah |
| RQ6e | . hypothesis testing ah |
| RQ6.2 | . . statistical tests ah |
| RQ8e | . quantitative data analysis ah |
| RQ8.2e | . . univariate analysis ah |
| RQ8.4e | . . correlation analysis ah |
| RQ8.4.8e | . . . regression analysis ah |
| RQ8.4.10e | . . . bivariate and multivariate analysis of variance ah |
| RQ8.4.10.2e | . . . . bivariate analysis of variance ah |
| RQ8.4.10.4e | . . . . multiple analysis of variance ah |
| RQ8.4.10.6e | . . . . analysis of covariance ah |
| RQ8.4.12e | . . . bivariate analysis ah |
| RQ8.4.14e | . . . multivariate analysis ah |
| RQ8.4.14.2 | . . . . canonical correlation analysis ah |
| RQ8.4.14.4e | . . . . discriminant analysis ah |
| RQ8.4.14.6e | . . . . factor analysis ah |
| RQ8.4.14.8e | . . . . cluster analysis ah |
| RQ8.4.14.10e | . . . . multidimensional scaling ah |
| RQ8.4.14.12e | . . . . causal path analysis ah |
| RQ8.4.14.14e | . . . . multilevel analysis ah |
| RQ8.4.14.14.2 | . . . . . hierarchical linear modeling ah |
| RQ8.4.14.16e | . . . . multicomponent analysis ah |
| RQ8.4.14.18e | . . . . mediation analysis ah |
| RQ8.4.16 | . . . covariation of variables ah |
| RQ8.6 | . . parametric and nonparametric statistics ah |
| RQ8.6.2 | . . . parametric statistics ah |
| RQ8.6.4 | . . . nonparametric statistics ah |
| RQ10 | . validation methods ah |
| RQ10.2e | . . cross-validation ah |
| RQ12 | . method for handling incomplete data ah |
| RQ14 | . synchronic and diachronic analysis ah |
| RQ14.2e | . . synchronic analysis ah |
| RQ14.4e | . . diachronic analysis ah |
| RQ14.4.2e | . . . latent-variable models of change ah |
| RQ14.4.4e | . . . time series analysis ah |
| RQ16e | . geographic analysis ah |
| RQ16.2e | . . spatial data analysis ah |
| RQ16.2.2e | . . . spatial autocorrelation ah |
| RQ16.2.2.2e | . . . . spatial cluster analysis ah |
| RRe | qualitative research method d-out ah |
| RR4e | . qualitative data analysis ah |
| RS | models and simulation d-out ah |
| RS2e | . scientific model ah |
| RS2.2 | . . conceptual model ah |
| RS2.4e | . . statistical modeling ah |
| RS2.4.2 | . . . survival modeling ah |
| RS2.6e | . . causal model ah |
| RS2.8 | . . mathematical model ah |
| RS2.8.2 | . . . structural equation model ah |
| RS2.10 | . . chemical model ah |
| RS2.12 | . . biological model ah |
| RS4 | . simulation ah |
| RS4.2 | . . dynamic simulation ah |
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