babysitting data

indivdiualSessions: number of sessions individual babysat for the litter, totalGroupSessions: number of sessions the group babysat for that litter, lnAge: natural log of the individual's age in days, condition: relative mass of the individual for its age, groupSize: the average group size of the group for the babysitting period, individualID: code for individual, group: code for group, litter: code for babysat litter, dominanceStatus: whether the individual was dominant during the babysitting period, everDominant: whether the individual became dominant in its lifetime

个体保姆会话数（indivdiualSessions）：个体为该幼崽窝提供保姆服务的会话总次数；群组保姆总会话数（totalGroupSessions）：该群组为该幼崽窝提供保姆服务的会话总次数；年龄自然对数（lnAge）：以日为单位的个体年龄的自然对数值；身体状况指标（condition）：个体基于其年龄的相对体质量；群组平均规模（groupSize）：保姆行为周期内该群组的平均成员数量；个体编码（individualID）：个体唯一标识代码；群组编码（group）：群组标识代码；幼崽窝编码（litter）：所保姆幼崽窝的标识代码；优势地位状态（dominanceStatus）：个体在保姆行为周期内是否处于优势地位；终身优势经历（everDominant）：个体在其生命周期内是否曾获得过优势地位