0
我進行SEM與lavaan
和semplot
庫, 我用例子爲包lavaan(異化的穩定性由惠頓)在SEM中表示清單變量上的弧形箭頭是什麼?
lower <-
'
11.834,
6.947, 9.364,
6.819, 5.091, 12.532,
4.783, 5.028, 7.495, 9.986,
-3.839, -3.889, -3.841, -3.625, 9.610,
-21.899, -18.831, -21.748, -18.775, 35.522, 450.288
'
# convert to a full symmetric covariance matrix with names
wheaton.cov <- getCov(lower, names=c("anomia67","powerless67", "anomia71",
"powerless71","education","sei"))
# the model
wheaton.model <-
'
# measurement model
ses =~ education + sei
alien67 =~ anomia67 + powerless67
alien71 =~ anomia71 + powerless71
# equations
alien71 ~ alien67 + ses
alien67 ~ ses
# correlated residuals
anomia67 ~~ anomia71
powerless67 ~~ powerless71'
fit <- sem(wheaton.model, sample.cov=wheaton.cov, sample.nobs=932)
semPaths(fit,whatLables="par",layout = "spring")
,我不能明白做代表了明顯的和潛在的變量accuratearrows。
謝謝,但最後一個問題,如果用虛線裝飾弧形箭頭(即殘差) –
虛線代表被限制爲某個值(通常爲零或一)的估計值。因此,當殘差方差箭頭點綴時,它將被限制在模型中的某個值。約束通常需要使模型可識別或給出一定的潛在因子。然而,這通常是通過約束變量之間的參數來實現的(你可以看到這發生在你的數字在71和71之間)。我有點不確定爲什麼殘差會受到限制。也許有人可以對此有所瞭解。 – kneijenhuijs