Category: Definitions. This page lists brief definitions of commonly used terms in statistics and research.

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

A

• Stats: What is an adverse event?
• Stats: What is an alpha level?

B

• Stats: What is a beta level?
• Stats: What is a binomial distribution?
• Stats: What is a binomial mean?
• Stats: What is a binomial probability?
• Stats: What is block randomization?
• Stats: What is a boxplot?

C

• Stats: What is a case control design?
• Stats: What is categorical data?
• Stats: What is a cohort design?
• Stats: What is a common cause of variation?
• Stats: What is a conditional probability?
• Stats: What is a control chart?
• Stats: What is a convenience sample?
• Stats: What is a correlation? (Pearson correlation)

D

• Stats: What is a decision rule?
• Definition: Descriptive study
• Definition: Descriptive statistics
• Stats: What is a diagnostic test?
• Definition: Dependent variable

E

• Definition: Entropy
• Definition: Experimental design

F

• Definition: Fagan nomogram

G

• Definition: Geometric mean

H | I

• Definition: Independence
• Definition: Inferential statistics
• Definition: Interval data
• Stats: What is the interquartile range?
• Definition: Independent variable

J | K

• Definition: Kappa

L

• Definition: Likelihood ratio
• Definition: Likelihood ratio (extra information)
• Stats: What is a longitudinal design?

M

• Stats: What is the mean? (sample mean/population mean)
• Stats: What is the median?
• Stats: What is the mode?
• Stats: What is a mosaic plot?

N

• Definition: Negative Predictive Value
• Definition: Nominal data
• Definition: Normal distribution
• Definition: Normal probabilities

O

• Definition: Observational design
• Definition: Odds
• Definition: Odds ratio
• Definition: Ordinal data

P

• Definition: Parallel groups design
• Definition: Parameter
• Definition: Percentiles
• Definition: Phi coefficient
• Stats: What is the point biserial correlation?
• Definition: Poisson distribution
• Definition: Population
• Definition: Positive Predictive Value
• Stats: What is a purposive sample?
• Definition: P-value

Q

• Definition: Qualitative data
• Definition: Quota sample

R

• Definition: Random sample
• Definition: Range
• Definition: Ratio Data
• Definition: Retrospective Study

S

• Definition: Sample
• Definition: Sensitivity
• Definition: Special cause of variation
• Definition: Specificity
• Definition: Standard error
• Definition: Standard deviation
• Definition: Statistic
• Definition: Stem and leaf diagram

T

• Stats: What is a T statistic?
• Stats: What is a Type I error?
• Stats: What is a Type II error?

U | V | W

• Stats: What is the weighted mean?

X | Y | Z

The definitions are also arranged within specific topics:

• Category: Control charts
• Category: Descriptive statistics
• Category: Diagnostic testing
• Category: Graphical display
• Category: Hypothesis testing
• Category: Measuring agreement
• Category: Poisson regression
• Category: Quality control
• Category: Research designs

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