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# Functions from package 'SKAT' v.0.82 (c) 2011, with changes
# Function get parameters of optimal test
#
SKAT_Optimal_Param<-function(Z1,r.all){
n<-dim(Z1)[1]
p.m<-dim(Z1)[2]
r.n<-length(r.all)
z_mean<-rowMeans(Z1)
Z_mean<-matrix(rep(z_mean,p.m),ncol=p.m,byrow=FALSE)
cof1<-(t(z_mean) %*% Z1)[1,] / sum(z_mean^2)
Z.item1<-Z_mean %*% diag(cof1)
Z.item2<-Z1 - Z.item1
# W3.2 Term : mixture chisq
W3.2.t<-t(Z.item2) %*% Z.item2
lambda<-Get_Lambda(W3.2.t)
# W3.3 Term : variance of remaining ...
W3.3.item<-sum((t(Z.item1) %*% Z.item1) * (t(Z.item2) %*% Z.item2)) * 4
# Mixture Parameters
MuQ<-sum(lambda)
VarQ<-sum(lambda^2) *2 + W3.3.item
KerQ<-sum(lambda^4)/(sum(lambda^2))^2 * 12
Df<-12/KerQ
# W3.1 Term : tau1 * chisq_1
tau<-rep(0,r.n)
for(i in 1:r.n){
r.corr<-r.all[i]
#term1<-p.m*r.corr + cof1^2 * (1-r.corr)
term1<-p.m^2*r.corr + sum(cof1^2) * (1-r.corr)
tau[i]<-sum(term1) * sum(z_mean^2)
}
out<-list(MuQ=MuQ,VarQ=VarQ,KerQ=KerQ,lambda=lambda,VarRemain=W3.3.item,Df=Df,tau=tau)
return(out)
}
#
# Function get SKAT statistics with given rho
# Q.all is a matrix with n.q x n.r
SKAT_Optiaml_Each_Q<-function(param.m, Q.all, r.all, lambda.all, method=NULL){
n.r<-length(r.all)
c1<-rep(0,4)
n.q<-dim(Q.all)[1]
pval<-matrix(rep(0,n.r*n.q),ncol=n.r)
pmin.q<-matrix(rep(0,n.r*n.q),ncol=n.r)
param.mat<-NULL
for(i in 1:n.r){
Q<-Q.all[,i]
r.corr<-r.all[i]
lambda.temp<-lambda.all[[i]]
c1[1]<-sum(lambda.temp)
c1[2]<-sum(lambda.temp^2)
c1[3]<-sum(lambda.temp^3)
c1[4]<-sum(lambda.temp^4)
param.temp<-Get_Liu_Params_Mod(c1)
muQ<-param.temp$muQ
varQ<-param.temp$sigmaQ^2
df<-param.temp$l
# get pvalue
Q.Norm<-(Q - muQ)/sqrt(varQ) * sqrt(2*df) + df
pval[,i]<- pchisq(Q.Norm, df = df, lower.tail=FALSE)
# will be changed later
if(!is.null(method)){
if(method=="optimal.mod" || method=="optimal.adj" || method=="optimal.moment.adj" ){
pval[,i]<-Get_PValue.Lambda(lambda.temp,Q)$p.value
}
}
param.mat<-rbind(param.mat,c(muQ,varQ,df))
}
pmin<-apply(pval,1,min)
for(i in 1:n.r){
muQ<-param.mat[i,1]
varQ<-param.mat[i,2]
df<-param.mat[i,3]
q.org<-qchisq(1-pmin,df=df)
q.q<-(q.org - df)/sqrt(2*df) *sqrt(varQ) + muQ
pmin.q[,i]<-q.q
}
out<-list(pmin=pmin,pval=pval,pmin.q=pmin.q)
return(out)
}
SKAT_Optimal_Integrate_Func_Davies<-function(x,pmin.q,param.m,r.all,acc,lim){
n.r<-length(r.all)
n.x<-length(x)
temp1<-param.m$tau %x% t(x)
temp<-(pmin.q - temp1)/(1-r.all)
temp.min<-apply(temp,2,min)
re<-rep(0,length(x))
for(i in 1:length(x)){
#a1<<-temp.min[i]
min1<-temp.min[i]
if(min1 > sum(param.m$lambda) * 10^4){
temp<-0
} else {
min1.temp<- min1 - param.m$MuQ
sd1<-sqrt(param.m$VarQ - param.m$VarRemain)/sqrt(param.m$VarQ)
min1.st<-min1.temp *sd1 + param.m$MuQ
dav.re<-davies(min1.st,param.m$lambda,acc = acc,lim = lim)
temp<-dav.re$Qq
if(dav.re$ifault != 0){
stop("dav.re$ifault is not 0")
}
}
if(temp > 1){
temp=1
}
#lambda.record<<-param.m$lambda
#print(c(min1,temp,dav.re$ifault,sum(param.m$lambda)))
re[i]<-(1-temp) * dchisq(x[i],df=1)
}
return(re)
}
SKAT_Optimal_Integrate_Func_Kuonen<-function(x,pmin.q,param.m,r.all){
n.r<-length(r.all)
n.x<-length(x)
temp1<-param.m$tau %x% t(x)
temp<-(pmin.q - temp1)/(1-r.all)
temp.min<-apply(temp,2,min)
re<-rep(0,length(x))
for(i in 1:length(x)){
#a1<<-temp.min[i]
min1<-temp.min[i]
if(min1 > sum(param.m$lambda) * 10^4){
temp<-0
} else {
min1.temp<- min1 - param.m$MuQ
sd1<-sqrt(param.m$VarQ - param.m$VarRemain)/sqrt(param.m$VarQ)
min1.st<-min1.temp *sd1 + param.m$MuQ
temp <- pchisqsum(min1.st, rep(1, length(param.m$lambda)), param.m$lambda, lower.tail = F, method = 'sad')
}
if(temp > 1){
temp=1
}
#lambda.record<<-param.m$lambda
#print(c(min1,temp,dav.re$ifault,sum(param.m$lambda)))
re[i]<-(1-temp) * dchisq(x[i],df=1)
}
return(re)
}
# add pmin on 02-13-2013
SKAT_Optimal_PValue_Davies_Kuonen<-function(pmin.q,param.m,r.all, pmin=NULL, method, acc, lim){
#re<-try(integrate(SKAT_Optimal_Integrate_Func_Davies, lower=0, upper=30, subdivisions=500, pmin.q=pmin.q,param.m=param.m,r.all=r.all,abs.tol = 10^-15), silent = TRUE)
if (method == 'kuonen') { re<-try(integrate(SKAT_Optimal_Integrate_Func_Kuonen, lower=0, upper=40, subdivisions=1000, pmin.q=pmin.q,param.m=param.m,r.all=r.all,abs.tol = 10^-25), silent = TRUE)
} else { re<-try(integrate(SKAT_Optimal_Integrate_Func_Davies, lower=0, upper=40, subdivisions=1000, pmin.q=pmin.q,param.m=param.m,r.all=r.all,acc=acc,lim=lim,abs.tol = 10^-25), silent = TRUE) }
if(class(re) == "try-error"){
re<-SKAT_Optimal_PValue_Liu(pmin.q,param.m,r.all, pmin)
return(re)
}
pvalue<-1-re[[1]]
if(!is.null(pmin)){
if(pmin *length(r.all) < pvalue){
pvalue = pmin *length(r.all)
}
}
return(pvalue)
}
SKAT_Optimal_Integrate_Func_Liu<-function(x,pmin.q,param.m,r.all){
#x<-1
#print(length(x))
#print(x)
#X1<<-x
#x<-X1
n.r<-length(r.all)
n.x<-length(x)
temp1<-param.m$tau %x% t(x)
temp<-(pmin.q - temp1)/(1-r.all)
temp.min<-apply(temp,2,min)
temp.q<-(temp.min - param.m$MuQ)/sqrt(param.m$VarQ)*sqrt(2*param.m$Df) + param.m$Df
re<-pchisq(temp.q ,df=param.m$Df) * dchisq(x,df=1)
return(re)
}
# add pmin on 02-13-2013
SKAT_Optimal_PValue_Liu<-function(pmin.q,param.m,r.all, pmin=NULL){
re<-integrate(SKAT_Optimal_Integrate_Func_Liu, lower=0, upper=40, subdivisions=2000
,pmin.q=pmin.q,param.m=param.m,r.all=r.all,abs.tol = 10^-25)
pvalue<-1-re[[1]]
if(!is.null(pmin)){
if(pmin *length(r.all) < pvalue){
pvalue = pmin *length(r.all)
}
}
return(pvalue)
}
SKAT_Optimal_Get_Pvalue<-function(Q.all, Z1, r.all, method, acc, lim){
n.r<-length(r.all)
n.q<-dim(Q.all)[1]
p.m<-dim(Z1)[2]
lambda.all<-list()
for(i in 1:n.r){
r.corr<-r.all[i]
R.M<-diag(rep(1-r.corr,p.m)) + matrix(rep(r.corr,p.m*p.m),ncol=p.m)
if (r.corr < 1) { L<-chol(R.M,pivot=TRUE)
} else {
L <- R.M / sqrt(p.m)
}
Z2<- Z1 %*% t(L)
K1<-t(Z2) %*% Z2
lambda.all[[i]]<-Get_Lambda(K1)
}
# Get Mixture param
param.m<-SKAT_Optimal_Param(Z1,r.all)
Each_Info<-SKAT_Optiaml_Each_Q(param.m, Q.all, r.all, lambda.all, method=method)
pmin.q<-Each_Info$pmin.q
pmin<-Each_Info$pmin
pval<-rep(0,n.q)
if(method == "davies" || method=="kuonen" || method=="optimal" || method=="optimal.mod" || method=="optimal.adj"){
for(i in 1:n.q){
pval[i]<-SKAT_Optimal_PValue_Davies_Kuonen(pmin.q[i,],param.m,r.all, pmin[i], method, acc = acc, lim = lim)
}
} else if(method =="liu" || method =="liu.mod" || method=="optimal.moment" || method=="optimal.moment.adj" ){
for(i in 1:n.q){
pval[i]<-SKAT_Optimal_PValue_Liu(pmin.q[i,],param.m,r.all, pmin[i])
}
} else {
stop("Invalid Method!")
}
# Check the pval
# Since SKAT-O is between burden and SKAT, SKAT-O p-value should be <= min(p-values) * 2
# To correct conservatively, we use min(p-values) * 3
multi<-3
if(length(r.all) < 3){
multi<-2
}
for(i in 1:n.q){
pval.each<-Each_Info$pval[i,]
IDX<-which(pval.each > 0)
pval1<-min(pval.each) * multi
if(pval[i] <= 0 || length(IDX) < length(r.all)){
pval[i]<-pval1
}
# if pval==0, use nonzero min each.pval as p-value
if(pval[i] == 0){
if(length(IDX) > 0){
pval[i] = min(pval.each[IDX])
}
}
}
return(list(p.value=pval,p.val.each=Each_Info$pval))
}
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