| design_info {dexter} | R Documentation |
Information about the design
Description
This function is useful to inspect incomplete designs
Usage
design_info(dataSrc, predicate = NULL)
Arguments
dataSrc |
a connection to a dexter database, a matrix, or a data.frame with columns: person_id, item_id, item_score |
predicate |
An optional expression to subset data, if NULL all data is used |
Value
a list with the following components
- design
a data.frame with columns booklet_id, item_id, item_position, n_persons
- connected_booklets
a data.frame with columns booklet_id, group; booklets with the same 'group' are connected to each other.
- connected
TRUE/FALSE indicating whether the design is connected or not
- testlets
a data.frame with columns item_id and testlet; items within the same testlet always occur together in a booklet
- adj_matrix
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*