SSF_ImmediateFlight_NextDay

Data used to asses the step selection function (SSF) of zebras using the immediate-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与狮子遭遇次日采用即时逃逸策略时的步选择函数（step selection function, SSF），对应研究问题4。各列字段说明如下：id为斑马个体编号；FakeTime为伪时间变量，仅包含2个取值；case为二分类变量，观测步取值为1，随机步取值为0；strata为层编号，每个观测步会与10个随机步配对并归入对应层；cluster为聚类群编号，该聚类群对应一组非独立的层，用于稳健方差估计；TacticCont为分类变量，用于指示步的发生场景：取值为"Tactic"时表示步发生在遭遇狮子后，取值为"Control"时表示步处于主动预演阶段；Grassland为二分类变量，若步的终点位于草原则取值为1，否则为0；Bushland-1、Bushland-2、Bushland-3均为二分类变量，分别对应三类灌丛生境；Woodland为二分类变量，指示步终点是否位于林地；Spline1-4为以米为单位的步长样条变量；Step Length为以米为单位的实际步长。