[统计软件与数据分析]mplus新手求助：*** ERROR in Model command Unknown variable(s) in a BY statement:[推广有奖]

NPUT INSTRUCTIONS

TITLE: This is an example of a SEM with two mediators;

DATA: FILE IS d:\mplus\JMGZ.dat;

VARIABLE: NAMES ARE a1-a4 c1-c4 b1-b14 d1-d6 f1-f5;

USEVARIABLE=a1-a4 c1-c4 b1-b14 d1-d6 f1-f5;

ANALYSIS:Bootstrap=5000;

MODEL: CC BY c1-c4*;!定义社区关心因子；

CA BY a1-a4*!定义社区依附因子；

SA by f1-f5*!定义支持态度因子；

PB1 BY b1-b3*!定义城市形象提升因子；

PB2 BY b4-b7*!定义居民个人收益因子；

PB3 BY b8-b10*!定义城市经济收益因子；

PB4 BY b11-b14*!定义居民生活质量提升因子；

PB BY PB1-PB4*!定义感知收益二阶因子；

PC1 BY d1-d2*!定义环境成本因子；

PC2 BY d3-d4*!定义文化成本因子；

PC3 BY d5-d6*!定义城市公共服务压力因子；

PC BY d1-d2*!定义感知成本二阶因子；

CC@1;CA@1;SA@1;PB@1;PC@1;

SA on PB PC;

PB on CC CA;

PC on CC CA;

MODEL INDIRECT:

CC IND PB SA;

CC IND PC SA;

CA IND PB SA;

CA IND PC SA;

OUTPUT:STANDARDIZED CINTERVAL(bcbootstrap);

*** ERROR in Model command

Unknown variable(s) in a BY statement: SA