¥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
¥