我似乎无法按性别分组并计算随时间变化的偏好频率
尝试过：
PreferenceOverTimeByAge <- group_by(all7Wide$a_sex_dv)%>%
count(all7Wide$'preference_over_time')
但出现错误：
UseMethod（“ group_by_”）中的错误：没有适用于 “ group_by_”应用于“字符”类的对象
表看起来像这样
all7Wide
pidp . a_sex_dv . preference_over_time .
1 . male . Conservative_Labour_Conservative
2 . female . Labour_Labour_Labour
3 . male . Labour_Labour_Labour
4 . male . Labour_Labour_Labour
5 . female . Conservative_Labour_Labour
我想产生一个像这样的表
a_sex_dv preference_over_time . frequency
male . Conservative_Labour_Conservative . 1
female . Conservative_Labour_Conservative 0
male . Labour_Labour_Labour 2
female . Labour_Labour_Labour 1
male . Conservative_Labour_Labour . 0
female . Conservative_Labour_Labour . 1