sbtscs | R Documentation |
sbtscs()
allows you to create spells ("peace years" in
the international conflict context) between observations of some event. This
will allow the researcher to better model temporal dependence in binary time-series
cross-section ("BTSCS") models.
sbtscs(data, event, tvar, csunit, pad_ts = FALSE)
data |
the data set with which you are working |
event |
some event (0, 1) for which you want spells or peace years |
tvar |
the time variable (e.g. a year) |
csunit |
the cross-sectional unit (likely a dyad if you're doing boilerplate international conflict stuff) |
pad_ts |
should time-series be filled when panels are unbalanced/have gaps? Defaults to FALSE. |
I should confess outright, and it should be obvious to anyone
who looks at the code, that I liberally copy from Dave Armstrong's
btscs()
function in the DAMisc package. I offer two such improvements.
One, the btscs()
function chokes when a large number of cross-sectional units
have no recorded "event." I don't know why this happens but it does. Further, "tidying"
up the code by leaning on dplyr substantially speeds up computation. Incidentally,
this concerns the same cross-sectional units with no recorded events that can choke the
btscs()
function in large numbers.
sbtscs()
takes a data frame and returns the data frame with a new variable
named spell
.
David A. Armstrong, Steven V. Miller
Armstrong, Dave. 2016. “DAMisc: Dave Armstrong's Miscellaneous Functions.” R package version 1.4-3.
Miller, Steven V. 2017. “Quickly Create Peace Years for BTSCS Models with sbtscs
in stevemisc
.”
http://svmiller.com/blog/2017/06/quickly-create-peace-years-for-btscs-models-with-stevemisc/
## Not run:
library(dplyr)
library(stevemisc)
data(usa_mids)
# notice: no quotes
sbtscs(usa_mids, midongoing, year, dyad)
## End(Not run)
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