Here I provide ANOVA F tests for various split plot repeated measures
ANOVAs I was considering, where there are 7 potential factors.
A = animal (animal is random, nested in strain or strain*sex)
between-animal fixed effects(levels):
S = strain(20), F = sex(2)
within-animal fixed effects(levels):
D = drug(3), T = trial set(4), P = prepulse(2), I = isi(2)
D, T, P, and I are crossed within subject
P and I are stimulus characteristics aiding response
D order is randomized by animal to deal with carry over problems
The study is a survey of mouse strain (genetic) differences in response
to
drugs, thus A(?), S(20), and D(3) are necessary for any model. Because
strain has 20 levels, it is hard to make more complex designs
work within the matsize limit of 11,000. I worked out the required
matsize
assuming either 4 or 8 animals per strain*sex combination (160 or 320
animals),
suggesting only a SPRM[1,2] design with a matsize of 2-4K is possible.
I could just manipulate P rather than P and I. It's also possible
to average over the 4 5-minute trial sets, dropping out T. It's also
possible
to do separate ANOVAs for each P*I combination. Also, existing
literature does not suggest strong sex effects. That leaves S, A, and
D, and P.
I could assume higher order interactions are not significant too. These
are not the most desirable choices. I just did not realize complicated
ANOVA designs are so computationally intensive in large data sets. How
annoying.
Anybody have design suggestions to reduce problems with matsize? Note,
the within subject design was chosen because of individual differences
and an
inability to get more than 20 animals per strain.
SP/RM[1,1] SP/RM[1,2] SP/RM[1,3] SP/RM[1,4]
A, S, D A, S, D, T A, S, D, T, P A, S, D, T,
P, I
- 20 3 - 20 3 4 - 20 3 4 2 - 20 3 4
2 2
------------------------------------------------------------------------
-----
S / A|S S / A|S S / A|S S / A|S
D / DA|S D / DA|S D / DA|S D / DA|S
SD / DA|S SD / DA|S SD / DA|S
SD / E
T / TA|S T / TA|S T / TA|S
ST / TA|S ST / TA|S ST / TA|S
DT / DTA|S P / PA|S P / PA|S
SP / PA|S SP / PA|S
SDT / E
DT / DTA|S I / IA|S
SDT / DTA|S SI / IA|S
DP / DPA|S DT / DTA|S
SDP / DPA|S SDT / DTA|S
TP / TPA|S DP / DPA|S
STP / TPA|S SDP / DPA|S
DTP / DTPA|S DI / DIA|S
SDI / DIA|S
SDTP / E
TP / TPA|S
STP / TPA|S
TI / TIA|S
STI / TIA|S
PI / PIA|S
SPI / PIA|S
DTP / DTPA|S
SDTP /
DTPA|S
DTI / DTIA|S
SDTI /
DTIA|S
DPI / DPIA|S
SDPI /
DPIA|S
TPI / TPIA|S
STPI /
TPIA|S
DTPI /
DTPIA|S
SDTPI / E
SD/RM[2,1] SD/RM[2,2] SD/RM[2,3] SD/RM[2,4]
A, S, F, D A, S, F, D, T A, S, F, D, T, P A, S, F, D,
T, P, I
- 20 2 3 - 20 2 3 4 - 20 2 3 4 2 - 20 2 3 4
2 2
------------------------------------------------------------------------
-----
S / A|SF S / A|SF S / A|SF S / A|SF
F / A|SF F / A|SF F / A|SF F / A|SF
SF / A|SF SF / A|SF SF / A|SF SF / A|SF
