hQTL analysis with IHW-Benjamini-Yekutieli
5 November 2019
Package
IHWpaper 1.14.0
Contents
library(ggbio)
library(dplyr)
library(IHW)
library(fdrtool)
library(cowplot)
library(tidyr)
library(scales)
library(latex2exp)Let us start by loading in the data:
file_loc <- system.file("extdata","real_data", "hqtl_chrom1_chrom2", package = "IHWpaper")First the two tables with the p-values corresponding to the two chromosomes. Note that only p-values <= 1e-4 are stored in these.
chr1_df <- readRDS(file.path(file_loc, "chr1_subset.Rds"))
chr2_df <- readRDS(file.path(file_loc, "chr2_subset.Rds"))pval_threshold <- 10^(-4)Also recall each hypothesis corresponds to a peak (which we call gene below) and a SNP. Hence let us load files about each of the SNPs and peaks:
snp_chr1 <- readRDS(file.path(file_loc, "snppos_chr1.Rds"))
snp_chr2 <- readRDS(file.path(file_loc, "snppos_chr2.Rds"))
all_peaks <- readRDS(file.path(file_loc, "peak_locations.Rds"))
peaks_chr1 <- dplyr::filter(all_peaks, chr=="chr1")
peaks_chr2 <- dplyr::filter(all_peaks, chr=="chr2")We can use these both to infer how many hypotheses were conducted in total (or at a given distance), but also to calculate our covariates which are a function of SNP and peak (their distance).
Now let us attach the new column with the covariate (distance) to the data frames.
chr1_df <- left_join(chr1_df, select(snp_chr1, snp, pos), by=(c("SNP"="snp"))) %>%
left_join(peaks_chr1, by=(c("gene"="id"))) %>%
mutate( dist = pmin( abs(pos-start), abs(pos-end)))
chr2_df <- left_join(chr2_df, select(snp_chr2, snp, pos), by=(c("SNP"="snp"))) %>%
left_join(peaks_chr2, by=(c("gene"="id"))) %>%
mutate( dist = pmin( abs(pos-start), abs(pos-end)))Now let us convert the distance to a categorical covariate by binning:
my_breaks <- c(-1,
seq(from=10000,to=290000, by=10000) ,
seq(from=300000, to=0.9*10^6, by=100000),
seq(from=10^6, to=25.1*10^7, by=10^7))
myf1 <- cut(chr1_df$dist, my_breaks)
myf2 <- cut(chr2_df$dist, my_breaks)To apply our method despite the fact that only small p-values are available, we will count how many hypotheses there are in each of the bins. The above code is not very efficient, so we have precomputed these and do not run the below chunk.
cnt = 0
ms <- ms*0
pb = txtProgressBar(min = 0, max = nrow(peaks_chr1), initial = 0)
for (i in 1:nrow(peaks_chr1)){
setTxtProgressBar(pb,i)
start_pos <- peaks_chr1$start[i]
end_pos <- peaks_chr1$end[i]
dist_vec <- pmin( abs(snp_chr1$pos - start_pos), abs(snp_chr1$pos - end_pos) )
ms <- ms + table(cut(dist_vec, my_breaks))
}
saveRDS( ms, file = "m_groups_chr1.Rds" )
cnt = 0
ms_chr2 <- table(myf2)*0
pb = txtProgressBar(min = 0, max = nrow(peaks_chr2), initial = 0)
for (i in 1:nrow(peaks_chr2)){
setTxtProgressBar(pb,i)
start_pos <- peaks_chr1$start[i]
end_pos <- peaks_chr1$end[i]
dist_vec <- pmin( abs(snp_chr2$pos - start_pos), abs(snp_chr2$pos - end_pos) )
ms_chr2 <- ms_chr2 + table(cut(dist_vec, my_breaks))
}
saveRDS( ms_chr2, file = "m_groups_chr2.Rds" )Let us load the result from the above execution:
ms_chr1 <- readRDS(file.path(file_loc, "m_groups_chr1.Rds"))
ms_chr2 <- readRDS(file.path(file_loc, "m_groups_chr2.Rds"))Let us put the data for the two chromosomes together:
chr1_chr2_df <- rbind(chr1_df, chr2_df)
chr1_chr2_groups <- as.factor(c(myf1,myf2))
folds_vec <- as.factor(c(rep(1, nrow(chr1_df)), rep(2, nrow(chr2_df))))
m_groups <- cbind(ms_chr1, ms_chr2)m <- sum(m_groups) #total number of hypotheses
m## [1] 157250168121 Histogram plots
Get our colors:
beyonce_colors <- c("#b72da0", "#7c5bd2", "#0097ed","#00c6c3",
"#9cd78a", "#f7f7a7", "#ebab5f", "#e24344",
"#04738d")#,"#d8cdc9")
beyonce_colors[6] <- c("#dbcb09") # thicker yellow
pretty_colors <- beyonce_colors[c(2,1,3:5)]set.seed(1)
n_subsample <- 10000
chr1_chr2_df_sub <- sample_n(filter(chr1_chr2_df, pvalue <= 1e-7),n_subsample)
qs <- c(0.25,0.5, 0.75)
cutoffs <- c(0, quantile(chr1_chr2_df_sub$dist,qs), Inf)
cov_scatter_gg <- ggplot(chr1_chr2_df_sub, aes(x=rank(dist),y=-log10(pvalue))) +
geom_point(alpha=0.2, col=pretty_colors[1]) +
geom_vline(xintercept=qs*n_subsample, linetype="dashed") +
ylab(expression(paste(-log[10],"(p-value)"))) +
xlab(expression(paste("Rank of distance")))
cov_scatter_gg
ggsave(cov_scatter_gg, filename="cov_scatter_gg.pdf", width=4,height=3)chr1_chr2_df$cutoff_groups <- cut(chr1_chr2_df$dist, cutoffs)
table(chr1_chr2_df$cutoff_groups)##
## (0,2.31e+04] (2.31e+04,3.38e+05] (3.38e+05,7.56e+07]
## 30718 46700 1171817
## (7.56e+07,Inf]
## 1166910First let us plot the marginal histogram:
gg_marginal_hist <- ggplot(chr1_chr2_df, aes(x=pvalue*10^4)) +
geom_histogram(aes(y=..density..), alpha=0.5, binwidth=0.05, boundary = 0, colour="black",fill=pretty_colors[1]) +
scale_x_continuous(expand = c(0.02, 0), breaks=c(0,0.5,1)) +
scale_y_continuous(expand = c(0.02, 0), limits=c(0,2.5)) +
ylab(expression(paste("Density")))+
xlab(TeX("p-value ($\\times 10^{-4}$)"))
gg_marginal_hist
ggsave(gg_marginal_hist, filename="gg_marginal_hist.pdf", width=4,height=3)gg_stratified_hist <- ggplot(chr1_chr2_df, aes(x=pvalue*10^4)) +
geom_histogram(aes(y=..density..), alpha=0.5, binwidth=0.05, boundary = 0, colour="black",fill=pretty_colors[1]) +
scale_x_continuous(expand = c(0.02, 0), breaks=c(0,0.5,1)) +
scale_y_continuous(expand = c(0.02, 0), limits=c(0,11)) +
ylab("Density")+
xlab(TeX("p-value ($\\times 10^{-4}$)")) +
facet_grid(~cutoff_groups) +
theme(strip.background = element_blank(), strip.text.y = element_blank()) +
theme(panel.spacing = unit(2, "lines"))
gg_stratified_hist 
ggsave(gg_stratified_hist, filename="gg_stratified_hist.pdf", width=9,height=3)2 Apply IHW-BY and BY
We want to apply the Benjamini-Yekutieli at alpha=0.1, thus we will apply Benjamini-Hochberg at the corrected level:
alpha <- .01/(log(m)+1)Now let us run the IHW procedure:
ihw_chr1_chr2 <- ihw(chr1_chr2_df$pvalue, chr1_chr2_groups, alpha, folds=folds_vec,
m_groups=m_groups, lambdas=2000)Rejections of BH:
sum(p.adjust(chr1_chr2_df$pvalue, n = m, method="BH") <= alpha)## [1] 9110Rejections of IHW-BY:
rejections(ihw_chr1_chr2)## [1] 21903So we see that we more than doubled discoveries!
3 Hypotheses shown in table
For our table we need one hypothesis in Chr1 that gets rejected both times (by BH and IHW):
idx <- which(rejected_hypotheses(ihw_chr1_chr2) & (p.adjust(chr1_chr2_df$pvalue, n = m, method="BH") > alpha) &
(covariates(ihw_chr1_chr2)==3) & (ihw_chr1_chr2@df$fold == 1))
idx_max <- which.max(pvalues(ihw_chr1_chr2)[idx])
ihw_chr1_chr2@df[idx[idx_max],]## pvalue adj_pvalue weight weighted_pvalue group covariate fold
## 45723 9.738823e-07 0.0004046323 1731.2 5.625477e-10 3 3 1chr1_df[idx[idx_max],]## # A tibble: 1 x 11
## SNP gene beta tstat pvalue FDR pos chr start end dist
## <chr> <int> <dbl> <dbl> <dbl> <dbl> <int> <chr> <int> <int> <int>
## 1 rs6177… 13328 -0.907 -5.34 9.74e-7 0.168 1.65e6 chr1 1.62e6 1.62e6 23098We need one in Chr1 that gets weight 0:
idx <- which( !rejected_hypotheses(ihw_chr1_chr2) & (p.adjust(chr1_chr2_df$pvalue, n = m, method="BH") > alpha) &
(covariates(ihw_chr1_chr2)==15) & (ihw_chr1_chr2@df$fold == 1))
idx_max <- which.max(pvalues(ihw_chr1_chr2)[idx])
ihw_chr1_chr2@df[idx[idx_max],]## pvalue adj_pvalue weight weighted_pvalue group covariate fold
## 1182156 9.999058e-05 1 0 1 15 15 1ihw_chr1_chr2@df[idx[idx_max],]## pvalue adj_pvalue weight weighted_pvalue group covariate fold
## 1182156 9.999058e-05 1 0 1 15 15 1chr1_df[idx[idx_max],]## # A tibble: 1 x 11
## SNP gene beta tstat pvalue FDR pos chr start end dist
## <chr> <int> <dbl> <dbl> <dbl> <dbl> <int> <chr> <int> <int> <int>
## 1 rs122… 16094 0.585 4.11 0.0001000 0.666 1.83e8 chr1 1.83e8 1.83e8 141957One which get rejected in both cases from Chr2 :
idx <- which( rejected_hypotheses(ihw_chr1_chr2) & (p.adjust(chr1_chr2_df$pvalue, n = m, method="BH") <= alpha) &
(covariates(ihw_chr1_chr2)==3) & (ihw_chr1_chr2@df$fold == 2))ihw_chr1_chr2@df[idx[9],]## pvalue adj_pvalue weight weighted_pvalue group covariate
## 1182483 1.237412e-19 2.792147e-15 1421.894 8.70256e-23 3 3
## fold
## 1182483 2chr2_df[idx[9]-nrow(chr1_df),]## # A tibble: 1 x 11
## SNP gene beta tstat pvalue FDR pos chr start end dist
## <chr> <int> <dbl> <dbl> <dbl> <dbl> <int> <chr> <int> <int> <int>
## 1 rs801… 72797 2.03 12.3 1.24e-19 4.17e-12 2.29e8 chr2 2.29e8 2.29e8 29469And another one that only gets rejected in one case
idx <- which( rejected_hypotheses(ihw_chr1_chr2) & (p.adjust(chr1_chr2_df$pvalue, n = m, method="BH") > alpha) &
(covariates(ihw_chr1_chr2)==1) & (ihw_chr1_chr2@df$fold == 2))
idx_max <- which.max(pvalues(ihw_chr1_chr2)[idx])
ihw_chr1_chr2@df[idx[idx_max],]## pvalue adj_pvalue weight weighted_pvalue group covariate
## 1247287 1.710631e-06 0.0004075483 3015.383 5.673015e-10 1 1
## fold
## 1247287 2chr2_df[idx[idx_max]-nrow(chr1_df),]## # A tibble: 1 x 11
## SNP gene beta tstat pvalue FDR pos chr start end dist
## <chr> <int> <dbl> <dbl> <dbl> <dbl> <int> <chr> <int> <int> <int>
## 1 rs2715… 78787 0.844 5.20 1.71e-6 0.207 9515551 chr2 9.51e6 9.51e6 15424 Set out to do the weight/threshold/lfdr plots
First get the threshold below which BY rejects:
t_bh <- get_bh_threshold(chr1_chr2_df$pvalue, alpha, mtests = m)
t_bh## [1] 2.363825e-10Next write a function to estimate the local fdr at a given threshold:
get_local_fdr <- function(fold, group){
idx <- (chr1_chr2_groups == group) & (folds_vec == fold)
pvals <- sort(chr1_chr2_df$pvalue[idx])
m_true <- m_groups[group,fold]
gren <- IHW:::presorted_grenander(pvals, m_true)
myt <- thresholds(ihw_chr1_chr2, levels_only=TRUE)[group,fold]
id_ihw_myt <- which(myt < gren$x.knots)[1]
local_fdr_ihw <- ifelse(myt == 0, 0, 1/gren$slope.knots[id_ihw_myt-1])
id_bh_thresh <- which(t_bh < gren$x.knots)[1]
local_fdr_bh <- 1/gren$slope.knots[id_bh_thresh-1]
pi0 <- (m_true - length(pvals))/(1-10^(-4))/m_true
data.frame(fold=fold, group=group, pi0=pi0, t_ihw=myt, local_fdr_ihw = local_fdr_ihw,
local_fdr_bh = local_fdr_bh)
}fold_groups <- expand.grid(1:62, 1:2)Precompute the below too because it takes a while:
lfdrs <- bind_rows(mapply(get_local_fdr, fold_groups[[2]], fold_groups[[1]], SIMPLIFY = FALSE))
saveRDS(lfdrs,file="hqtl_estimated_lfdrs.Rds")lfdrs <- readRDS(file.path(file_loc, "hqtl_estimated_lfdrs.Rds"))lfdrs <- mutate(lfdrs, Chromosome=paste0("chr", fold), stratum=group, t_bh=t_bh)5 Start the plotting
breaks <- my_breaks/10^3
breaks <- breaks[-1]
break_min <- 3000/10^3
breaks_left <- c(break_min,breaks[-length(breaks)])
stratum <- 1:62
step_df_weight <- data.frame(stratum=stratum, chr2=weights(ihw_chr1_chr2,levels_only=TRUE)[,1],
chr1=weights(ihw_chr1_chr2, levels_only=TRUE)[,2] ) %>%
gather(Chromosome, weight , -stratum)
step_df_threshold <- data.frame(stratum=stratum,
chr2=thresholds(ihw_chr1_chr2,levels_only=TRUE)[,2],
chr1=thresholds(ihw_chr1_chr2, levels_only=TRUE)[,1] ) %>%
gather(Chromosome, threshold , -stratum)
step_df <- left_join(step_df_weight, step_df_threshold) %>% left_join(lfdrs)## Joining, by = c("stratum", "Chromosome")
## Joining, by = c("stratum", "Chromosome")step_df <- step_df %>% mutate(break_left = breaks_left[stratum],
break_right = breaks[stratum],
break_ratio = break_right/break_left ,
break_left =break_left * break_ratio^.2,
break_right = break_right *break_ratio^(-.2))
stratum_fun <- function(df, colname="weight"){
stratum <- df$stratum
weight <- df[[colname]]
stratum_left <- stratum[stratum != length(stratum)]
weight_left <- weight[stratum_left]
break_left <- df$break_right[stratum_left]
stratum_right <- stratum[stratum != 1]
weight_right <- weight[stratum_right]
break_right <- df$break_left[stratum_right]
data.frame(stratum_left= stratum_left, weight_left= weight_left,
stratum_right = stratum_right, weight_right = weight_right,
break_left = break_left, break_right = break_right)
}
connecting_df_weights <- step_df %>% group_by(Chromosome) %>%
do(stratum_fun(.)) %>%
mutate(dashed = factor(ifelse(abs(weight_left - weight_right) > 0.5 , TRUE, FALSE),
levels=c(FALSE,TRUE)))
weights_panel <- ggplot(step_df, aes(x=break_left, xend=break_right,y=weight, yend=weight, col=Chromosome)) +
geom_segment(size=0.8)+
geom_segment(data= connecting_df_weights, aes(x=break_left, xend=break_right,
y=weight_left, yend=weight_right,
linetype=dashed),
size=0.8)+
scale_x_log10(breaks=c(10^4, 10^5,10^6,10^7,10^8),
labels = trans_format("log10", math_format(10^.x))) +
xlab("Genomic distance (bp)")+
ylab("Weight")+
theme(legend.position=c(0.8,0.6)) +
theme(plot.margin = unit(c(2, 1.5, 1, 2.5), "lines"))+
theme(axis.title = element_text(face="bold" ))+
scale_color_manual(values=pretty_colors)+
guides(linetype=FALSE)
weights_panel
# Weights chromosome 1
weights_panel_1 <- ggplot(filter(step_df, Chromosome == "chr1"), aes(x=break_left, xend=break_right,y=weight, yend=weight, col=Chromosome)) +
geom_segment(size=0.8,lineend="round")+
geom_segment(data= filter(connecting_df_weights, Chromosome=="chr1"), aes(x=break_left, xend=break_right,
y=weight_left, yend=weight_right,
linetype=dashed),
size=0.8,lineend="round")+
scale_x_log10(breaks=c(10, 10^2,10^3,10^4),
labels = trans_format("log10", math_format(10^.x))) +
scale_y_continuous(breaks=c(0,1000,2000))+
xlab(expression(paste("Distance (kbp)")))+
ylab(expression(paste("Weight")))+
theme(legend.position="none") +
theme(plot.margin = unit(c(2, 1.5, 1, 2.5), "lines"))+
theme(axis.title = element_text(face="bold" ))+
scale_color_manual(values=pretty_colors)+
guides(linetype=FALSE)
weights_panel_1
ggsave(weights_panel_1, filename="chr1_weights.pdf", width=3.5,height=2.5)weights_panel_2 <- ggplot(filter(step_df, Chromosome == "chr2"), aes(x=break_left, xend=break_right,y=weight, yend=weight, col=Chromosome)) +
geom_segment(size=0.8, lineend="round")+
geom_segment(data= filter(connecting_df_weights, Chromosome=="chr2"), aes(x=break_left, xend=break_right,
y=weight_left, yend=weight_right,
linetype=dashed),
size=0.8, lineend="round")+
scale_x_log10(breaks=c(10, 10^2,10^3,10^4),
labels = trans_format("log10", math_format(10^.x))) +
scale_y_continuous(breaks=c(0,1000,2000))+
xlab(expression(paste("Distance (kbp)")))+
ylab(expression(paste("Weight")))+
theme(legend.position="none") +
theme(plot.margin = unit(c(2, 1.5, 1, 2.5), "lines"))+
theme(axis.title = element_text(face="bold" ))+
scale_color_manual(values=pretty_colors)+
guides(linetype=FALSE)
weights_panel_2
ggsave(weights_panel_2, filename="chr2_weights.pdf", width=3.5,height=2.5)connecting_df_thresholds_ihw <- step_df %>% group_by(Chromosome) %>%
do(stratum_fun(., colname="t_ihw")) %>%
mutate(dashed = FALSE)#factor(ifelse(abs(weight_left - weight_right) > 10^{-7} , TRUE, FALSE),
# levels=c(FALSE,TRUE)))
thresholds_ihw_panel <- ggplot(step_df, aes(x=break_left, xend=break_right,y=t_ihw*10^6, yend=t_ihw*10^6, col=Chromosome)) +
geom_segment(size=0.8, lineend="round")+
geom_segment(data= connecting_df_thresholds_ihw, aes(x=break_left, xend=break_right,
y=weight_left*10^6, yend=weight_right*10^6,
linetype=dashed),
size=0.8, lineend="round")+
scale_x_log10(breaks=c(10, 10^2,10^3,10^4),
labels = trans_format("log10", math_format(10^.x))) +
scale_y_continuous(limits=c(0,1.8), breaks=c(0,1))+
xlab(expression(paste("Distance (kbp)")))+
ylab(expression(paste("IHW t(x) (",10^-6,")")))+
theme(legend.position=c(0.6,0.7), legend.title = element_blank()) +
theme(plot.margin = unit(c(2, 1.5, 1, 2.5), "lines"))+
theme(axis.title = element_text(face="bold" ))+
scale_color_manual(values=pretty_colors)+
guides(linetype=FALSE)
thresholds_ihw_panel
ggsave(thresholds_ihw_panel, filename="ihw_by_threshold.pdf", width=3.5,height=2.5)connecting_df_thresholds_bh <- step_df %>% group_by(Chromosome) %>%
do(stratum_fun(., colname="t_bh")) %>%
mutate(dashed = FALSE)#factor(ifelse(abs(weight_left - weight_right) > 10^{-11} , TRUE, TRUE),
#levels=c(FALSE,TRUE)))
scientific_10 = function(x) {ifelse(x==0, "0", parse(text=gsub("[+]", "", gsub("e", " %*% 10^", scientific_format()(x)))))}
thresholds_bh_panel <- ggplot(step_df, aes(x=break_left, xend=break_right,y=10^10*t_bh, yend=10^10*t_bh, col=Chromosome)) +
geom_segment(size=0.8)+
geom_segment(data= connecting_df_thresholds_bh, aes(x=break_left, xend=break_right,
y=weight_left*10^10, yend=weight_right*10^10,
linetype=dashed),
size=0.8)+
scale_x_log10(breaks=c(10, 10^2,10^3,10^4),
labels = trans_format("log10", math_format(10^.x))) +
scale_y_continuous(limits=c(0,5), breaks=c(0,2,4))+
xlab(expression(paste("Distance (kbp)")))+
ylab(expression(paste("BY t(x) (",10^-10,")")))+
theme(legend.position=c(0.6,0.7), legend.title = element_blank()) +
theme(plot.margin = unit(c(2, 1.5, 1, 2.5), "lines"))+
theme(axis.title = element_text(face="bold" ))+
scale_color_manual(values=pretty_colors)+
guides(linetype=FALSE)
thresholds_bh_panel
ggsave(thresholds_bh_panel, filename="by_threshold.pdf", width=3.5,height=2.5)connecting_df_lfdr_ihw <- step_df %>% group_by(Chromosome) %>%
do(stratum_fun(., colname="local_fdr_ihw")) %>%
mutate(dashed = FALSE)
lfdr_ihw_panel <- ggplot(step_df, aes(x=break_left, xend=break_right,y=10^1*local_fdr_ihw, yend=10^1*local_fdr_ihw, col=Chromosome)) +
geom_segment(size=0.8, lineend="round")+
geom_segment(data= connecting_df_lfdr_ihw, aes(x=break_left, xend=break_right,
y=10^1*weight_left, yend=10^1*weight_right,
linetype=dashed),
size=0.8,lineend="round")+
scale_x_log10(breaks=c(10, 10^2,10^3,10^4),
labels = trans_format("log10", math_format(10^.x))) +
xlab(expression(paste("Distance (kbp)")))+
ylab(expression(paste("IHW fdr(t(x) | x)")))+
theme(legend.position=c(0.6,0.7), legend.title = element_blank()) +
theme(plot.margin = unit(c(2, 1.5, 1, 2.5), "lines"))+
theme(axis.title = element_text(face="bold" ))+
scale_color_manual(values=pretty_colors)+
guides(linetype=FALSE)
lfdr_ihw_panel
ggsave(lfdr_ihw_panel, filename="ihw_by_fdr.pdf", width=3.5,height=2.5)connecting_df_lfdr_bh <- step_df %>% group_by(Chromosome) %>%
do(stratum_fun(., colname="local_fdr_bh")) %>%
mutate(dashed = FALSE)#factor(ifelse(abs(weight_left - weight_right) > 0.5*10^(-6) , TRUE, FALSE),
# levels=c(FALSE,TRUE)))
lfdr_bh_panel <- ggplot(step_df, aes(x=break_left, xend=break_right,y=local_fdr_bh, yend=local_fdr_bh, col=Chromosome)) +
geom_segment(size=0.8, lineend="round")+
geom_segment(data= connecting_df_lfdr_bh, aes(x=break_left, xend=break_right,
y=weight_left, yend=weight_right,
linetype=dashed),
size=0.8, lineend="round")+
scale_x_log10(breaks=c(10, 10^2,10^3,10^4),
labels = trans_format("log10", math_format(10^.x))) +
scale_y_log10( labels = trans_format("log10", math_format(10^.x)))+
xlab(expression(paste("Distance (kbp)")))+
ylab(expression(paste("BY fdr(t(x) | x)")))+
theme(legend.position=c(0.6,0.4), legend.title = element_blank()) +
theme(plot.margin = unit(c(2, 1.5, 1, 2.5), "lines"))+
theme(axis.title = element_text(face="bold" ))+
scale_color_manual(values=pretty_colors)+
guides(linetype=FALSE)
lfdr_bh_panel
ggsave(lfdr_bh_panel, filename="by_fdr.pdf", width=3.5,height=2.5)6 Figure of chromosomes 1 and 2
Below we use ggbio to create the ideograms of Human chromosomes 1 and 2.
#ggbio seems to be broken right now, fix later.
chr1_ideo <- Ideogram(genome = "hg19", subchr="chr1")@ggplot +
xlab(paste0("SNPs: ", nrow(snp_chr1), "\n",
"Peaks: ", nrow(peaks_chr1)))
chr2_ideo <- Ideogram(genome = "hg19", subchr="chr2")@ggplot + xlab("bla") +
xlab(paste0("SNPs: ", nrow(snp_chr2), "\n",
"Peaks: ", nrow(peaks_chr2)))
chrs_ideo <- plot_grid(chr1_ideo, chr2_ideo, nrow=2)
chrs_ideo