This function estimates the model parameters under the null model when there is no region genotypes effect, for the VCC methods
1  Estim.H0.VCC(y, X, S, U)

y 
Vector of phenotype values 
X 
A matrix of covariates, including intercept. 
S 
Matrix obtained from spectral decomposition of the relationship matrix: Φ = U S U^T. 
U 
Matrix obtained from spectral decomposition of the relationship matrix: Φ = U S U^T. 
a list of:
h.hat
: estimate of the (narrow sense) heritability
gam.hat
: a vector of estimates of fixed effects of the covariates
(if there are any).
residuals
: residuals from adjusting the null model
with only covariates in the model.
Karim Oualkacha
M'Hamed Lajmi LakhalChaieb
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