Table 5.

Keyword mappings categories and citation frequencies

Keyword mapping category	Common individual keywords within mapping category	Number of times keyword mapping category was cited
General/other statistical	models, statistical; data interpretation, statistical; biometry	4,806
Randomized trials	randomized controlled trials as topic; clinical trials as topic; treatment outcome	2,003
Epidemiology	risk factors; risk; epidemiologic methods	1,463
Meta-analysis	meta-analysis; metaregression; inverse probability weighted estimation	1,223
Generalized linear models	analysis of variance; regression analysis; logistic models	1,043
Computer simulation	computer simulation; Monte Carlo method; Markov chains; bootstrap	619
Analysis of correlated data	cluster analysis; longitudinal studies; mixed models	610
Missing data	missing data; multiple imputation; missing at random	529
Bias	bias (epidemiology); publication bias; file drawer problem	451
Survival analysis	survival analysis; proportional hazards models; survival-time	435
Sample size / power estimation	sample size; power; statistical power	426
Diagnostic testing	sensitivity and specificity; ROC curve; predictive value of tests	355
Bayesian methods	Bayes’ theorem; Winbugs; empirical Bayes	349
Study design	research design; design; 2-period crossover design	333
Bioinformatics methods	models, biological; oligonucleotide array sequence analysis; gene expression profiling	298
Statistical software	Software; st0067 (a Stata program for multiple imputation); databases, factual	194
Econometrics	cost-benefit analysis; cost analysis; costs and cost analysis	192
Non/Semi-parametrics	statistics, nonparametric; semiparametrics; nonparametric estimation	156
Reproducibility of results	reproducibility of results	104
Psychometrics	psychometrics; kappa statistic	64
Multiple comparisons	Bonferroni procedure; false discovery rate; multiple comparisons procedures	57
Non-statistical terminology	humans; female; male	16,097