This function is useful to inspect incomplete designs
design_info(dataSrc, predicate = NULL)
a connection to a dexter database, a matrix, or a data.frame with columns: person_id, item_id, item_score
An optional expression to subset data, if NULL all data is used
a list with the following components
a data.frame with columns booklet_id, item_id, item_position, n_persons
a data.frame with columns booklet_id, group; booklets with the same 'group' are connected to each other.
TRUE/FALSE indicating whether the design is connected or not
a data.frame with columns item_id and testlet; items within the same testlet always occur together in a booklet
list of two adjacency matrices: *weighted_by_items* and *weighted_by_persons*; These matrices can be useful in visually inspecting the design using a package like *igraph*
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