`nwattime`

Static graph view of a temporal network at a given time

Syntax

nwattime
[netname]
,
at(#)
[name(newnetname)
xvars
replace]


`at(#)`	The timepoint to slice at
`name(newnetname)`	Name of the new static network; default = atview
`xvars`	Generate Stata variables for the new network
`replace`	Replace an existing network of the same name

Description

nwattime takes a temporal network (declared via nwset’s time(), interval(), or eventtime() options) and produces an ordinary, static one-mode network containing only the ties active at the requested timepoint - the “temporal network -> select edges active at t -> static graph view -> ordinary nw algorithm” model: the resulting network is a completely normal network, usable with any existing nw* command exactly as if it had never been temporal at all. This is deliberate groundwork, not a full temporal-network modelling system - see nwset’s own temporal section for what is and is not supported yet.

The slicing rule depends on the source network’s own temporal semantics:

snapshot
a tie is active at t when its own recorded time equals t exactly
interval
a tie is active at t when start <= t < end - the documented convention.
A tie with a missing end (an ongoing tie with no recorded end date) is treated as open-ended
and stays active for every t from its start onward. A missing start is not specially
handled and excludes the tie
event
an exact-timestamp match: every event recorded at precisely t becomes a binary tie in
the static view. This is the one place an event network is allowed to become a persistent graph in
this package, and only because t was explicitly requested - no windowing or aggregation across a
range of timestamps is done (not yet supported)

For example, a network declared with nwset ego alter, time(wave) can be sliced to the ties that existed in wave 2:

. clear
. input ego alter wave
1 2 1
2 3 1
1 3 2
2 3 2
3 4 3
. end
. nwset ego alter, time(wave) name(mynet)
. nwattime mynet, at(2) name(wave2)

Supported network types

Binary: yes. Directed: preserved from the source network. Weighted: preserved from the source network’s own tie values (the slice selects which ties are active, it does not change their values). Signed: not checked. Two-mode: not yet supported as a source (see nwset’s own note that time()/ interval()/eventtime() cannot currently be combined with twomode/bipartite - a composability item for a later pass).

Stored results

Scalars

r(ties) number of rows in the tie list of the static view (an undirected tie is stored as two rows, so this is twice the number of ties in the printed Ties line)
r(at) the timepoint sliced at

nwattime

Syntax

Description

Supported network types

Stored results

See also

`nwattime`