SSF_DelayedFlight_NextDay

Data used to asses the step selection function (SSF) of zebras using the delayed-flight tactic the next day after an encounter with lions (question 4). Column headings: id = id of zebra, FakeTime = 2-case, case = binary variable with 1 for an observed step and 0 for a random step, strata = id of the stratum where an observed step is paired with 10 random steps, cluster = id of the cluster (group of non independent strata) used for robust variance, TacticCont = categorical variable indicating if the step occurred after an encounter ("Tactic") or during the proactive phase ("Control"), Grassland = binary variable with 1 if the step ended in grassland and 0 if not, Bushland-1 = binary variable, Bushland-2 = binary variable, Bushland-3 = binary variable, Woodland = binary variable, Spline1-4 = spline variable for step length in m, Step Length = length of the step in m.

本数据集用于评估斑马在遭遇狮子次日采取延迟逃逸策略（delayed-flight tactic）时的步选择函数（step selection function, SSF），对应研究问题4。各字段说明如下：id为斑马个体标识；FakeTime为双分类变量；case为二元变量，取值1代表观测得到的移动步，取值0代表随机生成的移动步；strata为分层单元（stratum）标识，每个观测步会与10个随机步配对归入同一分层单元；cluster为聚类（cluster）标识，聚类由非独立的分层单元组成，用于稳健方差估计；TacticCont为分类变量，用于标识该移动步发生于遭遇事件之后（类别为"Tactic"）还是主动预应对阶段（类别为"Control"）；Grassland为二元变量，若该步终点位于草原则取值为1，否则为0；Bushland-1、Bushland-2、Bushland-3均为二元变量；Woodland为二元变量；Spline1-4为以米为单位的步长样条（spline）变量；Step Length为以米为单位的移动步长度。