cumulative survival probability, 311–314

curvedline relationships,

214

CV (coefficient of variation), 120

D

data. See also crosstabulated data

analyzing and collecting, 1, 7, 9–10, 74–76, 101–110

categorical, 112–114

freetext,

103

interval and ordinal, 102

ratio, 102, 107–108

skewed and unskewed, 11, 114, 121, 353

survival, 208, 301–306, 337, 343

time, 108–110

data closeout,

76

data dictionary, 110

data safety monitoring board (DSMB), 73, 76

data safety monitoring committee (DSMC), 73

data snapshot, 76

date data, 108–110

date of last contact, 303

DBP (diastolic blood pressure), 116–117

deciliter (dL), 280

decision theory, 10, 39–40

degrees of freedom (df)

calculating, 147–148, 152–153

for chisquare tests,

166–167, 358–359

dementia, 91, 146, 187–188

denominator, 41–42

dependent variable, 208, 213, 235–245

descriptive research, 88–90

descriptive study designs, 91

desired power, 347

desired α level, 347