Description Usage Arguments Details Value Author(s) Examples
Fits a strategic model with two players and four terminal nodes, as in the game illustrated below in "Details".
1 2 3 4 
formulas 
a list of six formulas, or a 
data 
a data frame. 
subset 
an optional logical vector specifying which observations from

na.action 
how to deal with 
link 
whether to use a probit (default) or logit link structure, 
type 
whether to use an agenterror ("agent", default) or privateinformation ("private") stochastic structure. 
startvals 
whether to calculate starting values for the optimization from statistical backwards induction ("sbi", default), draw them from a uniform distribution ("unif"), or to set them all to 0 ("zero") 
fixedUtils 
numeric vector of values to fix for u11, u12, u13, u14,
u22, and u24. 
sdformula 
an optional list of formulas or a 
sdByPlayer 
logical: if scale parameters are being estimated (i.e.,

boot 
integer: number of bootstrap iterations to perform (if any). 
bootreport 
logical: whether to print status bar during bootstrapping. 
profile 
output from running 
method 
character string specifying which optimization routine to use
(see 
... 
other arguments to pass to the fitting function (see

The model corresponds to the following extensiveform game:
1 2 3 4 5 6 7 8 9  . ___ 1 ___
. / \
. / \
. 2 / \ 2
. / \ / \
. / \ / \
. / \ / \
. u11 u12 u13 u14
. 0 u22 0 u24

For additional details on any of the function arguments or options, see
egame12
. The only difference is that the righthand side of
formulas
must have six components (rather than four) in this case.
Ways to specify the dependent variable in egame122
:
Numeric vector y
, numbered 1 through 4, corresponding to the
outcomes as labeled in the game tree above.
Factor y
, where y
has four levels, corresponding in
order to the outcomes as labeled above.
Indicator variables y1 + y2
, where y1
indicates whether
Player 1 moves left or right, and y2
indicates whether Player 2 moves
left or right.
Indicator variables y1 + y2 + y3
, where y1
indicates
whether Player 1 moves left or right, y2
indicates Player 2's move in
case Player 1 moved left, and y3
indicates Player 2's move in case
Player 1 moved right. Nonobserved values of y2
and y3
should
be set to 0
, not NA
, to ensure that observations are
not dropped when na.action = na.omit
.
An object of class c("game", "egame122")
. See
egame12
for a description of the game
class.
Brenton Kenkel (brenton.kenkel@gmail.com) and Curtis S. Signorino
1 2 3 4 5 6 7 8 9 10 11 12 13 14  data("data_122")
## Model formula:
fr1 < y ~ x1 + x2  x3 + f1  0  x4 + x5  z1 + z2  z3 + f2
## ^ ^^^^^^^ ^^^^^^^ ^ ^^^^^^^ ^^^^^^^ ^^^^^^^
## y u11 u12 u13 u14 u22 u24
m1 < egame122(fr1, data = data_122)
summary(m1)
## Dummy specification of the dependent variable
fr2 < update(Formula(fr1), a1 + a2 ~ .)
m2 < egame122(fr2, data = data_122)
summary(m2)

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