06 Diagnostic Plots

Diagnostic Plots

plot_dsge()

Draws the null density curve for each selected pathway with the observed DSGE marked as a red dashed line. The GPD tail region is shown in orange. Requires pathway_dsge(..., return_null = TRUE).

Usage

# Top 9 by significance
plot_dsge(result, n = 9)

# Specific GO terms
plot_dsge(result, go_ids = c("GO:0007156", "GO:0007268"))

# Standardised scale (requires dsge_std = TRUE in pathway_dsge)
plot_dsge(result, n = 9, use_std = TRUE)

# Save to PDF
pdf("top9.pdf", width = 12, height = 10)
plot_dsge(result, n = 9)
dev.off()

Parameters

Parameter	Default	Description
result	(required)	Output of pathway_dsge(..., return_null = TRUE)
n	9	Number of top pathways to plot (by p_adj); ignored when go_ids is set
go_ids	NULL	Character vector of GO terms to plot, e.g. c("GO:0007156")
col_null	"steelblue"	Null distribution density curve colour
col_obs	"red"	Observed DSGE vertical line colour
col_tail	"#FFA50040"	GPD tail region colour (semi-transparent)
cex_main	0.85	Title font scaling
use_std	auto	If TRUE, plot standardised null and dsge_std on x-axis; defaults to TRUE when dsge_std column exists

plot_dsge_volcano()

Volcano plot visualisation of DSGE results (p-value vs. DSGE / NDS).

Null Distribution Diagnostic Scripts

The package ships with R scripts for diagnosing null distribution quality:

• null_density_plot.R: Plots null distribution densities across pathway sizes
• null_density_std_plot.R: Plots standardised null distributions
• gpd_diagnostic_plot.R: Assesses GPD fit quality for tail extrapolation

These are located in inst/scripts/ after installation.