inner mean, 118

integers, 107

interaction, 296–297

interaction terms, 237, 329

intercept, 215, 221, 224–225, 272, 329

intercept row, 224

interim analysis, 76

International Conference on Harmonization (ICH), 72

International Review Board (IRB), 72

Internet sources. See also G*Power; Microsoft Excel

ClinCalc, 14

Comprehensive R Archive Network (CRAN), 58

Epi Info, 59

GraphPad, 67

International Business Machines, 57

National Health and Nutrition Examination Survey (NHANES), 82, 86, 93, 148–157

National Institutes of Health (NIH), 72–73

OpenStat and LazStats, 59

Power and Sample Size Calculation (PS), 60, 171–172, 324–325

SAS OnDemand for Academics (ODA), 55–56

Statista, 34

StatPages, 158, 190, 282

interpolation, 208

interquartile range (IQR),

120

interrater reliability,

188–190

interval data, 102

interventionrelated measurements,

63

interventions, 61–62

intrarater reliability,

188–190

IQR (interquartile range),

120

IRB (International Review Board), 72

iterative models, 246–247

K