请问用SAS进行结构方程分析(PROC CALIS)时数据表card中的n ,mean ,cov是怎么来的??

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在下面的程序中我现在只有x1到y11的数值，，请问程序中说的n 、mean 、cov 是怎么来的啊？？还有type=cov是什么意思啊？？求好心人讲解！！


用 Sas 软件计算出 ACSI 模型的参数值，Sas 程序
如下：
title ‘the matrix for customer satisfaction indices’;
data csi (type=cov);
input _type_ $ _name_ $ x1 x2 x3 y1 y2 y3 y4 y5 y6 y7 y8 y9
y10 y11;
label x1= ‘the customer ’s gross expectation for the quality ’
x2= ‘the customer ’s expectation for the quality to meet his requirement’
x3= ‘the customer ’s expectation for the quality reliability’
y1= ‘the customer’s gross evaluation for the quality ’
y2= ‘the customer’s evaluation for the quality to meet his requirement’
y3= ‘the customer’s evaluation for the quality reliability’
y4= ‘the quality given, the evaluation for the price’
y5= ‘the price given, the evaluation for the quality’
y6= ‘the gross customer satisfaction’
y7= ‘the customer satisfaction after comparing the real level with the expected one’
y8= ‘the customer satisfaction after comparing the real level with the ideal one’
y9= ‘times of complaint’
y10= ‘the possibility of buying again’
y11= ‘the hold price’;
cards;
n …
mean …
cov … ;
proc calis data=csi cov;
lineqs
x1=lamb1 f1+e1,
x2=lamb2 f1+e2,
x3=lamb3 f1+e3,
y1=lamb11 f2+e4,
y2=lamb21 f2+e5,
y3=lamb31 f2+e6,
y4=lamb12 f3+e7,
y5=lamb22 f3+e8,
y6=lamb13 f4+e9,
y7=lamb23 f4+e10,
y8=lamb33 f4+e11,
y9=lamb14 f5+e12,
y10=lamb15 f6+e13,
y11=lamb25 f6+e14,
f2=gam1 f1 +d1,
f3= gam2 f1 + beta21 f2 +d2,
f4= gam3 f1 + beta31 f2 + beta32 f3 +d3,
f5= beta43 f4 + d4,
f6= beta53 f4 + beta54 f5 +d5;
std e1-e14=ve1-ve14,
d1-d5=vd1-vd5,
f1=vf1;
run;

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关键词：calis card 结构方程 mean CAR 数据表

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