Hi Mailing List,
I am fitting an LME model with random effects for B0 and B2, so I am using the
following to fit a spatiotemporal model:
lhstats = lme_mass_fit_Rgw(X,[1 3],Y,ni,lhTh0,lhRgs,lhsphere);
However, prior to this when i am computing the initial temporal covariance
estimates, do the s
Hi Bronwyn,
to shorten equations, lets set t = years_form_baseline
a = age
g = group
s = sex
so your model is
Y_ij = b0 + b1 t_ij + b2 a_i + b3 g_i + b4 s_i + b5 t_ij a_i + b6 t_ij g_i + b7
a_i g_i + b8 t_ij a_i g_i
(as a fist step, I would consider simplifying it, by dropping the age
interact
Hi Martin,
Thank you for your response, that is much clearer.
I am also a little confused about how to specify the exact contrasts we wish to
test and was hoping to get some advice. My design matrix X includes the
following columns:
1. Intercept
2. Years from baseline
3. Age at baseline
4. Gro
Hi Bronwyn,
I think years-between-scans should be years-from-baseline-scans . You may need
to compute that if what you have is really years between neighbouring scans.
1. Usually people use intercept and maybe years-from-baseline as random
effects. I would not include too many random effects,
Dear mailing list,
I am trying to run a LME model using the matlab tools, but I’m unsure how to
specify the model we wish to run. We have a qdec file that contains the
following columns:
fsid, fsid-abse, years between scans, age at baseline, gender, group
We want to specify a model where we can
