>  qls.fit <- qls(norm ~time+x1, data = normal.1, id = normal.1$id, time = normal.1$time,
+     correlation = "exchangeable")
> qls.fit

Call:
qls(formula = norm ~ time + x1, data = normal.1, id = normal.1$id,
    time = normal.1$time, correlation = "exchangeable")

Coefficients:
(Intercept)        time          x1
    1.16621     0.02031     0.95868

Degrees of Freedom: 240 Total (i.e. Null);  237 Residual

Scale Link:                   identity
Estimated Scale Parameters:  [1] 0.7115

Correlation:  Structure = exchangeable  Link = identity
Estimated Correlation Parameters:
alpha:1
 0.6869

Number of clusters:   80   Maximum cluster size: 3

我只想要提取qls.fit结果中的Estimated Correlation Parameters:
alpha:1
 0.6869 ，不知怎么提取，希望大家帮帮我！