graph_conversion function

Convert networks to graph objects

The method as.igraph() converts nma_data objects into the form used by the igraph package. The method as_tbl_graph()

converts nma_data objects into the form used by the ggraph and tidygraph packages.

## S3 method for class 'nma_data'
as.igraph(x, ..., collapse = TRUE)

## S3 method for class 'nma_data'
as_tbl_graph(x, ...)

Arguments

• x: An nma_data object to convert
• ...: Additional arguments
• collapse: Logical, collapse edges over studies? Default TRUE, only one edge is produced for each comparison (by IPD or AgD study type) with a .nstudy attribute giving the number of studies making that comparison. If FALSE, repeated edges are added for each study making the comparison.

Returns

An igraph object for as.igraph(), a tbl_graph object for as_tbl_graph().

Examples

# Set up network of smoking cessation data
head(smoking)

smk_net <- set_agd_arm(smoking,
                       study = studyn,
                       trt = trtc,
                       r = r,
                       n = n,
                       trt_ref = "No intervention")

# Print details
smk_net

# Convert to igraph object
igraph::as.igraph(smk_net)  # Edges combined by default
igraph::as.igraph(smk_net, collapse = FALSE)  # Without combining edges

# Convert to tbl_graph object
tidygraph::as_tbl_graph(smk_net)  # Edges combined by default
tidygraph::as_tbl_graph(smk_net, collapse = FALSE)  # Without combining edges