¥Regression
Analysis: 3dRegAna
HSimple
linear regression:
åY = b0 + b1X1,+
e
åwhere
Y represents the FMRI measurement (i.e. percent signal change) and X is the independent variable (i.e. drug
dose)
HMultiple
linear regression:
åY = b0 + b1X1 +
b2X2 +
b3X3 +
É+ e
HRegression
with qualitative and quantitative variables (ANCOVA)
åi.e.
drug dose (5mg, 12mg, 23mg, etc.) is quantitative while drug type (Nicotine, THC, Cocaine) or age group (young vs old) or
genotype is qualitative, and usually called dummy (or indicator)
variable
H2-way
ANOVA and 3-way ANOVA with unequal sample size (with ÒindicatorÓ variables)
HPolynomial
regression:
åY = b0 + b1X1 +
b2X12 +
É + e
HLinear
regression: model is a linear function of its unknowns bi NOT its independent variables Xi
HNot
for fitting time series, use 3dDeconvolve
(or 3dNLfim) instead