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Package: dfConn | ||
Type: Package | ||
Title: Dynamic Functional Connectivity Analysis | ||
Version: 0.1.0 | ||
Authors@R: c(person("Zikai", "Lin", email = "ziklin@iu.edu", role = c("aut", "cre")), | ||
person("Maria", "Kudela", email = "maria.kudela@gmail.com", role = c("aut")), | ||
person("Jaroslaw","Harezlak",email = "harezlak@iu.edu", role = c("aut")), | ||
person("Mario","Dzemidzic", email = "mdzemidz@iupui.edu", role = c("aut"))) | ||
Maintainer: Zikai Lin <ziklin@iu.edu> | ||
Description: An implementation of multivariate linear process bootstrap (MLPB) method and sliding window technique to assess the dynamic functional connectivity (dFC) estimate by providing its confidence bands, based on Maria Kudela (2017) <doi: 10.1016/j.neuroimage.2017.01.056>. | ||
It also integrates features to visualize non-zero coverage for selected a-priori regions of interest estimated by the dynamic functional connectivity model (dFCM) and dynamic functional connectivity (dFC) curves for reward-related a-priori regions of interest where the activation-based analysis reported. | ||
License: MIT + file LICENSE | ||
Encoding: UTF-8 | ||
LazyData: true | ||
Depends: R (>= 2.10) | ||
Suggests: iterators, testthat, itertools | ||
Imports: doParallel, nlme, parallel, foreach, ggplot2, knitr, | ||
RColorBrewer, fields, latex2exp, mgcv, gplots, splines, stats, | ||
stringr, graphics, data.table, gtools, Rcpp (>= 0.12.18) | ||
LinkingTo: Rcpp, RcppArmadillo | ||
RoxygenNote: 6.1.1 | ||
NeedsCompilation: yes | ||
Packaged: 2019-03-22 16:22:03 UTC; ziklin | ||
Author: Zikai Lin [aut, cre], | ||
Maria Kudela [aut], | ||
Jaroslaw Harezlak [aut], | ||
Mario Dzemidzic [aut] | ||
Repository: CRAN | ||
Date/Publication: 2019-03-23 09:13:24 UTC |
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YEAR: 2019 | ||
COPYRIGHT HOLDER: Lin, Zikai |
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fa28a1cdc5b5805cbfec838ac043fc4d *DESCRIPTION | ||
8dc4dd367716da3d741838c6a8e830ed *LICENSE | ||
93b7a7047065da580135d8dce6890273 *NAMESPACE | ||
1e70ac2c81d1c915a6bf6206f4b5638c *R/MLPB3.R | ||
09467175ccefa10462de4608b2b83769 *R/RcppExports.R | ||
c892bfcedfa1dc4dc17d51670001314d *R/data_summary_coverage.r | ||
771904ec595c41c37a5eaaa284955008 *R/dfConn.R | ||
66199f7cbe55168ee969ec3faeb4c8ac *R/lme_model0.r | ||
280e7ef9a179406017ccad79de2fc7ac *R/lme_model6.r | ||
1ad2e4f3571ca0d04394a2ca5ee582f6 *R/lmm_ci_vis.R | ||
e7420249fc19c4e3cb6791a217683ac1 *R/mlpb.R | ||
48345987ba7c60695901db2d4eb808ff *R/nzc_mat_construct.r | ||
a2ca620d8352fc8a38d8c2ebbf8e4d48 *R/nzc_mat_vis.r | ||
a2f439f6db7c754a7f0182f6143947f4 *R/plots.r | ||
61f720d5cb54596384caeae466f95993 *R/setters.R | ||
8d39b9c394ee48e22b7e392e9db4d594 *R/summary_table.r | ||
852948da1bed1d808d2a3739de5ae977 *R/sysdata.rda | ||
1137d1ad613ebc8fba702abfb16ca33d *R/utils.r | ||
929fb0a54af8e643467cf9a4a5a63a25 *README.md | ||
1dc116c571fd89cef1cbde6dadb83f66 *data/DynModel_results.rda | ||
c48f1474670b3f46d96982ecdade3d4d *data/MLPB_output_median.rda | ||
24944c332629f20dd1c739319178572f *data/coverage.tbl.list.rda | ||
d4fbd1314ed2648a8021c1336de9e6c1 *data/fMRI_dataList.rda | ||
c9bb9b3e1e798019ffa7f7483640cd0e *data/fMRI_dataList_shrinked.rda | ||
5073b53fa8f3088d8a6e4803a1f5e692 *man/DynModel_results.Rd | ||
709765a2b7c36d468f0676dfe24116f6 *man/MLPB3.Rd | ||
52d620f6e47149e5ab257c5ab674e824 *man/MLPB_boot.Rd | ||
ab420afbcb3b38f9209756efe02161a7 *man/MLPB_output_median.Rd | ||
66fb1817a2bcbca31c12fcb78a571dda *man/coverage.tbl.list.Rd | ||
625cd173de4cf8b896e448d235bb5225 *man/data_summary_coverage.Rd | ||
0a987d54dde8932b4799ed5867749d36 *man/fMRI_dataList.Rd | ||
97f3abf819c842e4d85af868b90cbd20 *man/fMRI_dataList_shrinked.Rd | ||
c1d5ee13d0e7343a822a3a1cdd63cb9d *man/lmmConn.Rd | ||
f8041479fe05ef1ed078a5af8654a54a *man/lmmDyn.Rd | ||
294039488892ec38f4342b58d921a1ca *man/nzc_vis.Rd | ||
f103a402addfdebb68cca4c21b339339 *man/plot_generate_timeDependence.Rd | ||
23b3dd69cab930e98293c85d89100dfe *src/MLPB3.cpp | ||
61059660eb073d93e00e8ee054237071 *src/Makevars | ||
61059660eb073d93e00e8ee054237071 *src/Makevars.win | ||
af378eca0bc4b9114d08e0c7d121036b *src/RcppExports.cpp |
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# Generated by roxygen2: do not edit by hand | ||
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export(MLPB3) | ||
export(MLPB_boot) | ||
export(data_summary_coverage) | ||
export(lmmConn) | ||
export(lmmDyn) | ||
export(nzc_vis) | ||
export(plot_generate_timeDependence) | ||
import(Rcpp) | ||
importFrom(Rcpp,evalCpp) | ||
importFrom(data.table,rbindlist) | ||
importFrom(gtools,combinations) | ||
importFrom(parallel,makePSOCKcluster) | ||
importFrom(stats,cor) | ||
importFrom(stats,mad) | ||
importFrom(stats,median) | ||
importFrom(stats,qnorm) | ||
importFrom(stats,quantile) | ||
importFrom(utils,write.csv) | ||
useDynLib(dfConn) |
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#' @title Multivariate Linear Bootstrapping - core function | ||
#' @param X data matrix | ||
#' @param Boot integer, number of bootstrap samples to be generated | ||
#' @param l numeric, the banding parameter, default is 1 | ||
#' @param eps numeric the parameters for making Gamma_kappa_matrix positive definite if necessary, default is 1; | ||
#' @param beta numeric the parameters for making Gamma_kappa_matrix positive definite if necessary, default is 1; | ||
#' @param l_automatic numeric the banding parameter, default is 1, data-adaptively; | ||
#' @param l_automatic_local numeric, the banding parameter default is 0 | ||
#' @return a numeric matrix with n*boot rows and m columns, where n, m refer to the number of rows and number of columns in input data matrix, and boot refer to number of bootstrap samples to be generated. | ||
#' @examples | ||
#' # Multivariate linear bootstrapping on a random matrix with 2 rows and 4 columns | ||
#' MLPB3(matrix(rnorm(16),2,4), 3) | ||
#' | ||
#' @export | ||
#' @useDynLib dfConn | ||
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MLPB3 <- function(X, Boot, l = 1, eps = 1, beta = 1, l_automatic = 0, l_automatic_local = 0) { | ||
requireNamespace("stats") | ||
# Dimension of observed values | ||
n1 <- dim(X)[1] | ||
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# sample sizes of (n1-dimensional) data observed | ||
n2 <- dim(X)[2] | ||
N <- n1 * n2 | ||
# Boot<-100 | ||
l_matrix <- matrix(rep(l, n1^2), n1, n1) | ||
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# Defining function kappa (trapezoid [cf. McMurry & Politis (2010)]) | ||
kappa <- function(x, l) { | ||
kappa <- matrix(0, dim(l)[1], dim(l)[2]) | ||
kappa[l > 0] <- 2 - abs(x/l[l > 0]) | ||
kappa[abs(x/l) <= 1 & l != 0] <- 1 | ||
kappa[abs(x/l) > 2 & l != 0] <- 0 | ||
kappa | ||
} | ||
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# Rearranging the data columnwise in one large n1*n2-dimensional vector | ||
X_vec <- X | ||
dim(X_vec) <- NULL | ||
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######################################################################## Here starts the computation of covariances ### | ||
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# Estimating all multivariate covariances and putting them in one large n1*(2n2-1) matrix C_matrix<-matrix(rep(0,(n1*n1*(2*n2-1))),n1,(2*n2-1)*n1) | ||
# C_matrix_kappa_trans<-matrix(rep(0,(n1*n1*(2*n2-1))),n1,(2*n2-1)*n1) R_matrix_kappa_trans<-matrix(rep(0,(n1*n1*(2*n2-1))),n1,(2*n2-1)*n1) | ||
C_matrix <- C_matrix_kappa_trans <- R_matrix_kappa_trans <- matrix(0, n1, (2 * n2 - 1) * n1) | ||
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# Sample mean | ||
if (n1 == 1) | ||
X_mean <- mean(X) else X_mean <- rowMeans(X) | ||
# if(n1!=1){ X_mean<-rep(0,n1) for(k in 1:n1){ X_mean[k]<-mean(X[k,]) } } | ||
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# Computing C_matrix | ||
for (k in (-(n2 - 1)):(n2 - 1)) { | ||
blub <- 0 | ||
if (n1 == 1) | ||
C_matrix[, ((((n2 + k) - 1) * n1 + 1):(((n2 + k) - 1) * n1 + n1))] <- (1/n2) * t(X[(max(1, 1 - k) + k):(min(n2, n2 - k) + k)] - X_mean) %*% (X[(max(1, 1 - k)):(min(n2, | ||
n2 - k))] - X_mean) else C_matrix[, ((((n2 + k) - 1) * n1 + 1):(((n2 + k) - 1) * n1 + n1))] <- (1/n2) * (X[, (max(1, 1 - k) + k):(min(n2, n2 - k) + k)] - X_mean) %*% t(X[, (max(1, 1 - | ||
k)):(min(n2, n2 - k))] - X_mean) | ||
# if(n1!=1) C_matrix[,((((n2+k)-1)*n1+1):(((n2+k)-1)*n1+n1))]<-(1/n2)*(X[,(max(1,1-k)+k):(min(n2,n2-k)+k)]-X_mean)%*%t(X[,(max(1,1-k)):(min(n2,n2-k))]-X_mean) | ||
} | ||
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if (l_automatic == 1) { | ||
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################################## Computing Autocorrelations ### | ||
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R_matrix <- matrix(0, n1, (2 * n2 - 1) * n1) | ||
denominator_matrix <- matrix(0, n1, n1) | ||
diag(denominator_matrix) <- sqrt(diag(C_matrix[, (n1 * (n2 - 1) + 1):(n1 * n2)])) | ||
denominator_matrix <- solve(denominator_matrix) | ||
for (k in 1:(2 * n2 - 1)) { | ||
R_matrix[, ((k - 1) * n1 + 1):(k * n1)] <- denominator_matrix %*% C_matrix[, ((k - 1) * n1 + 1):(k * n1)] %*% denominator_matrix | ||
} | ||
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M_zero <- 2 | ||
M_zero_sqrt <- M_zero * sqrt(log10(n2)/n2) | ||
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if (l_automatic_local == 0) { | ||
h <- 1 | ||
marker <- 0 | ||
while (marker == 0) { | ||
# Kn_vec<-seq(1,max(5,log10(n2))) if(max((abs(R_matrix[,((2*n2-1)+h*n1):((2*n2-1+n1-1)+n1*(max(5,log10(n2))+h-1))])))<M_zero*sqrt(log10(n2)/n2)) marker<-1 | ||
if (max((abs(R_matrix[, (n1 * (n2 - 1) + 1 + h * n1):(n1 * n2 + n1 * (max(5, log10(n2)) + h - 1))]))) < M_zero_sqrt) | ||
marker <- 1 | ||
l_adapt <- h - 1 | ||
h <- h + 1 | ||
} | ||
l <- l_adapt | ||
l_matrix_adapt <- matrix(rep(l, n1^2), n1, n1) | ||
l_matrix <- l_matrix_adapt | ||
} | ||
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if (l_automatic_local == 1) { | ||
l_matrix_adapt <- matrix(0, n1, n1) | ||
marker <- matrix(0, n1, n1) | ||
for (j in 1:n1) { | ||
for (k in 1:n1) { | ||
h <- 1 | ||
while (marker[j, k] == 0) { | ||
if (max(abs(R_matrix[j, seq((n1 * (n2 - 1) + 1 + h * n1 + k - 1), (n1 * n2 + n1 * (max(5, log10(n2)) + h - 1) + k - 1), by = n1)])) < M_zero_sqrt) | ||
marker[j, k] <- 1 | ||
l_matrix_adapt[j, k] <- h - 1 | ||
h <- h + 1 | ||
} | ||
} | ||
} | ||
l_matrix <- l_matrix_adapt | ||
} | ||
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} | ||
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# Computing C_matrix_kappa_trans | ||
for (k in (-(n2 - 1)):(n2 - 1)) { | ||
blub <- 0 | ||
if (n1 == 1) | ||
C_matrix_kappa_trans[, ((((n2 + k) - 1) * n1 + 1):(((n2 + k) - 1) * n1 + n1))] <- (kappa(k, l_matrix)/n2) * t(X[(max(1, 1 - k) + k):(min(n2, n2 - k) + k)] - X_mean) %*% | ||
(X[(max(1, 1 - k)):(min(n2, n2 - k))] - X_mean) | ||
if (n1 != 1 && k < 0) | ||
C_matrix_kappa_trans[, ((((n2 + k) - 1) * n1 + 1):(((n2 + k) - 1) * n1 + n1))] <- t(t((kappa(k, l_matrix)/n2)) * (X[, (max(1, 1 - k) + k):(min(n2, n2 - k) + k)] - | ||
X_mean) %*% t(X[, (max(1, 1 - k)):(min(n2, n2 - k))] - X_mean)) | ||
if (n1 != 1 && k == 0) | ||
C_matrix_kappa_trans[, ((((n2 + k) - 1) * n1 + 1):(((n2 + k) - 1) * n1 + n1))] <- t((1/n2) * (X[, (max(1, 1 - k) + k):(min(n2, n2 - k) + k)] - X_mean) %*% t(X[, | ||
(max(1, 1 - k)):(min(n2, n2 - k))] - X_mean)) | ||
if (n1 != 1 && k > 0) | ||
C_matrix_kappa_trans[, ((((n2 + k) - 1) * n1 + 1):(((n2 + k) - 1) * n1 + n1))] <- t((kappa(k, l_matrix)/n2) * (X[, (max(1, 1 - k) + k):(min(n2, n2 - k) + k)] - | ||
X_mean) %*% t(X[, (max(1, 1 - k)):(min(n2, n2 - k))] - X_mean)) | ||
} | ||
############################################################################# Computing the diagonal matrix for standardization to get autocorrelations (as above) | ||
denominator_matrix <- matrix(0, n1, n1) | ||
diag(denominator_matrix) <- sqrt(diag(C_matrix[, (n1 * (n2 - 1) + 1):(n1 * n2)])) | ||
denominator_matrix <- solve(denominator_matrix) | ||
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# Computing R_matrix_kappa_trans (for equivariance to construct positive definite estimator) | ||
for (k in (-(n2 - 1)):(n2 - 1)) { | ||
blub <- 0 | ||
if (n1 == 1) | ||
R_matrix_kappa_trans[, ((((n2 + k) - 1) * n1 + 1):(((n2 + k) - 1) * n1 + n1))] <- (1/stats::var(as.vector(X))) * (kappa(k, l_matrix)/n2) * t(X[(max(1, 1 - k) + | ||
k):(min(n2, n2 - k) + k)] - X_mean) %*% (X[(max(1, 1 - k)):(min(n2, n2 - k))] - X_mean) | ||
if (n1 != 1 && k < 0) | ||
R_matrix_kappa_trans[, ((((n2 + k) - 1) * n1 + 1):(((n2 + k) - 1) * n1 + n1))] <- denominator_matrix %*% t(t((kappa(k, l_matrix)/n2)) * (X[, (max(1, 1 - k) + | ||
k):(min(n2, n2 - k) + k)] - X_mean) %*% t(X[, (max(1, 1 - k)):(min(n2, n2 - k))] - X_mean)) %*% denominator_matrix | ||
if (n1 != 1 && k == 0) | ||
R_matrix_kappa_trans[, ((((n2 + k) - 1) * n1 + 1):(((n2 + k) - 1) * n1 + n1))] <- denominator_matrix %*% t((1/n2) * (X[, (max(1, 1 - k) + k):(min(n2, n2 - k) + | ||
k)] - X_mean) %*% t(X[, (max(1, 1 - k)):(min(n2, n2 - k))] - X_mean)) %*% denominator_matrix | ||
if (n1 != 1 && k > 0) | ||
R_matrix_kappa_trans[, ((((n2 + k) - 1) * n1 + 1):(((n2 + k) - 1) * n1 + n1))] <- denominator_matrix %*% t((kappa(k, l_matrix)/n2) * (X[, (max(1, 1 - k) + k):(min(n2, | ||
n2 - k) + k)] - X_mean) %*% t(X[, (max(1, 1 - k)):(min(n2, n2 - k))] - X_mean)) %*% denominator_matrix | ||
} | ||
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# Arranging the autocovariance matrices in R_matrix_kappa_trans in one large matrix corresponding to X_vec | ||
R_kappa_matrix <- matrix(rep(0, N * N), N, N) | ||
for (i in 1:n2) { | ||
R_kappa_matrix[(((i - 1) * n1 + 1):((i - 1) * n1 + n1)), ] <- R_matrix_kappa_trans[, (n1 * (n2 - i) + 1):(n1 * (2 * n2 - i))] | ||
} | ||
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R_kappa_matrix_hilf <- R_kappa_matrix | ||
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# Computing the eigenvalues and eigenvectors of Gamma_kappa_matrix | ||
spectraldecomposition <- eigen(R_kappa_matrix) | ||
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# orthogonal matrix | ||
S <- spectraldecomposition$vectors | ||
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# diagonal matrix | ||
D <- diag(spectraldecomposition$values) | ||
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D_eps_counter <- 0 | ||
# Manipulating the diagonal matrix D to ensure positive definiteness | ||
if (min(diag(D)) <= eps * N^(-beta)) { | ||
D_eps_counter <- D_eps_counter + 1 | ||
D_eps <- D | ||
D_non_definite <- D | ||
# for(k in 1:N){ D_eps[k,k]<-max(D[k,k],eps*N^(-beta)) } | ||
diag(D_eps) <- ifelse(diag(D) > eps * N^(-beta), diag(D), eps * N^(-beta)) | ||
# Computing the banded positive definite covariance matrix estimator | ||
R_kappa_matrix <- S %*% D_eps %*% t(S) | ||
} | ||
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# Get back to autocovariances! | ||
Gamma_kappa_matrix <- matrix(rep(0, N * N), N, N) | ||
nominator_matrix <- solve(denominator_matrix) | ||
for (i in 1:n2) { | ||
for (j in 1:n2) { | ||
Gamma_kappa_matrix[(((i - 1) * n1 + 1):((i - 1) * n1 + n1)), (((j - 1) * n1 + 1):((j - 1) * n1 + n1))] <- nominator_matrix %*% R_kappa_matrix[(((i - 1) * n1 + | ||
1):((i - 1) * n1 + n1)), (((j - 1) * n1 + 1):((j - 1) * n1 + n1))] %*% nominator_matrix | ||
} | ||
} | ||
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# Computing the (lower-left) Cholesky decomposition | ||
L <- t(chol(Gamma_kappa_matrix)) | ||
L_inv <- solve(L) | ||
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# Multilpication of L and centered X_vec that is X_vec_cent X_cent<-matrix(rep(0,n1*n2),n1,n2) for(k in 1:n1){ X_cent[k,]<-X[k,]-X_mean[k] } | ||
X_cent <- X - rowMeans(X) | ||
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# Rearranging the data columnwise in one large n1*n2-dimensional vector | ||
X_vec_cent <- X_cent | ||
dim(X_vec_cent) <- NULL | ||
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# 'Whitening' the centered data | ||
W_vec <- L_inv %*% X_vec_cent | ||
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# Computing the centered and standardized residuals Z_vec | ||
W_vec_cent <- W_vec - mean(W_vec) | ||
W_vec_var <- stats::var(W_vec) | ||
dim(W_vec_var) <- NULL | ||
Z_vec <- (1/sqrt(W_vec_var)) * W_vec_cent | ||
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W_matrix <- matrix(W_vec, n1, n2) | ||
# W_matrix_cent<-matrix(rep(0,n1*n2),n1,n2) for(k in 1:n1){ W_matrix_cent[k,]<-W_matrix[k,]-mean(W_matrix[k,]) } | ||
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W_matrix_cent <- W_matrix - rowMeans(W_matrix) | ||
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W_matrix_var <- (1/n2) * W_matrix_cent %*% t(W_matrix_cent) | ||
W_matrix_var_inv <- solve(t(chol(W_matrix_var))) | ||
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# W_matrix_stud<-matrix(rep(0,n1*n2),n1,n2) for(k in 1:n2){ W_matrix_stud[,k]<-W_matrix_var_inv%*%W_matrix_cent[,k] } | ||
W_matrix_stud <- W_matrix_var_inv %*% W_matrix_cent | ||
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Z_vec <- W_matrix_stud | ||
dim(Z_vec) <- NULL | ||
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########################################################################## Here starts the LPB bootstrap loop ### | ||
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# rewrite LPB bootstrap loop using Rcpp, Xiaochun Li | ||
sv_draw <- replicate(Boot, sample(1:n2, n2, replace = TRUE)) | ||
boot_func(Boot, sv_draw, matrix(Z_vec, nrow = n1), L) | ||
} |
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# Generated by using Rcpp::compileAttributes() -> do not edit by hand | ||
# Generator token: 10BE3573-1514-4C36-9D1C-5A225CD40393 | ||
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myseq <- function(start, end, by) { | ||
.Call('_dfConn_myseq', PACKAGE = 'dfConn', start, end, by) | ||
} | ||
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boot_func <- function(Boot, sw_mat, Z_mat, L) { | ||
.Call('_dfConn_boot_func', PACKAGE = 'dfConn', Boot, sw_mat, Z_mat, L) | ||
} | ||
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mm_func <- function(Xjj, F, mm, n_boot, window_size = 20L, n_sig = 750L) { | ||
.Call('_dfConn_mm_func', PACKAGE = 'dfConn', Xjj, F, mm, n_boot, window_size, n_sig) | ||
} | ||
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boot_cjj_func <- function(Xjj, MLPB3, boot_rep = 250L, n_boot = 1L, n_sig = 750L, window_size = 20L) { | ||
.Call('_dfConn_boot_cjj_func', PACKAGE = 'dfConn', Xjj, MLPB3, boot_rep, n_boot, n_sig, window_size) | ||
} | ||
|
||
a_func <- function(bootjj, up_limit = 731L, n_sig = 750L, window_size = 20L) { | ||
.Call('_dfConn_a_func', PACKAGE = 'dfConn', bootjj, up_limit, n_sig, window_size) | ||
} | ||
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||
bootcjj <- function(X, MLPB3, up_limit = 731L, window_size = 20L, boot_rep = 250L, n_boot = 1L, n_sig = 750L) { | ||
.Call('_dfConn_bootcjj', PACKAGE = 'dfConn', X, MLPB3, up_limit, window_size, boot_rep, n_boot, n_sig) | ||
} | ||
|
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