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Overview of the words



                    Overview of the content
in our online dictionary                 

You need to know the meaning of the words to have clear conversations

If you don't know what the words mean, your research will progress slowly and it will be difficult to explain where you get stuck.


In our online dictionary you will find a list of all important terms about research. Each term is explained in a clear way and each statistical tests has a clear example. It will save you hours of searching. Moreover, if you know what the terms mean, you are already on the way to applying them correctly. This allows you to conduct your research faster and easier.


The dictionary is only accessible with a basic membership. If you are already a member, you can surf directly to the explanation of the word in question using one of the keywords below. If you are not yet a member, you must first subscribe.

  • Adjusted R2
  • Analysing qualitative data, the five steps of -
  • Analysing quantitative data, the five steps of -
  • ANOVA
  • ANCOVA
  • Applied research
  • Average


  • Bias


  • Case study
  • Chi square distribution
  • Chi square test
  • Chi square test for frequency distributions
  • Chi square test for contingency tables
  • Chi square value
  • Clinical research trial
  • Code book
  • Cohen's Kappa
  • Collecting data (5 main ways)
  • Comparative research design
  • Conceptual model
  • Confidence interval
  • Confounder
  • Construct validity
  • Content validity
  • Control variable
  • Correlation
  • Counterbalancing
  • Covariable
  • Cramérs V
  • Cronbach's alpha


  • Data analysis, plan of -
  • Degrees of freedom
  • Dependent variable
  • Design
  • Descriptive research
  • Desk research
  • Dichotomy
  • Dropouts
  • Dummy variable


  • Evaluation research design
  • Evidence based practice
  • Experimental research design
  • Explorative research design


  • F-distribution
  • F-value
  • Face validity
  • Factor analysis
  • Field research
  • Friedman test
  • Fundamental research


  • Gathering data
  • Generating data


  • Hierarchical regression
  • Hypotheses, how to formulate a -


  • Independent variable
  • Informed consent
  • Internal consistency
  • Internal validity
  • Interobserver reliability
  • Interval data
  • Interview / interviewing
  • Interviewer bias


  • Kappa
  • Kendall's tau
  • Kolmogorov Smirnov-test
  • Kruskal-Wallis test
  • Kurtosis


  • Laboratory research
  • Likert scale
  • Longitudinal research design
  • Mann-Whitney test


  • MANOVA
  • Matching
  • Mean
  • Measuring
  • Measuring with instruments
  • Median
  • Mediation
  • Mode
  • Model
  • Moderation
  • Multicollinearity
  • Multi level analyses
  • Multiple choice question
  • Multiple correlation
  • Multiple regression
  • Multiple response question


  • Nominal data
  • Non-response
  • Non-response, Reasons for -
  • Non-response research
  • Normal distribution


  • Objectivity
  • Observing
  • Operationalizing
  • Ordinal data
  • Outlier


  • p-value
  • Placebo
  • Phi-coefficient
  • Population
  • Predictive validity
  • Problem statement


  • Qualitative research
  • Quantitative research
  • Quantitative value
  • Questions, types of -


  • Random, at -
  • Range
  • Ratio data
  • Regression
  • Reliability
  • Replicability
  • Representativity
  • Research, definition of -
  • Research question
  • Respons


  • Sample / sampling
  • Scientific research
  • Secondary data analysis
  • Semantic differential
  • Shapiro-Wilk test
  • Simulation
  • Skewness
  • Spearman rank correlation
  • Split half reliability
  • Spurious effect
  • Standard deviation
  • Survey


  • Text analysis
  • Test-retest reliability
  • Test-test reliability
  • Test for normality
  • Theory
  • Transferring data
  • Triangulation
  • t-distribution
  • t-test (groups)
  • t-test (one sample)
  • t-test (pairs)
  • t-value


  • Univariate regression

  • Validity
  • Variable
  • Variance
  • VIF-value


  • Weighting
  • Wilcoxon-test


  • z-value
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