stata求解（求和问题）

想要求和independent director并用变量呈现，包含数百家公司的数据，下列仅为一家公司的数据

BoardRole
Chairman/CEO
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director
Independent Director

我认为数据是横向的，而我想要获得竖向的数据。该用什么命令呢?