> m110  <-gamlss(BUAnormal~cs(log(age1),df=2)+cs(log(BMI),df=1),sigma.fo=~cs(log(age1),df=0)+cs(log(BMI),df=1),nu.fo=~cs(age1,df=0),tau.formula=~cs(age1,df=2),data=hannan,family=BCCG)
GAMLSS-RS iteration 1: Global Deviance = 11404.3
GAMLSS-RS iteration 2: Global Deviance = 11404.28
GAMLSS-RS iteration 3: Global Deviance = 11404.26
GAMLSS-RS iteration 4: Global Deviance = 11404.26
> hannan$tau<-predict(m110,newdata=hannan,what="tau",type="response")
Error in formula.gamlss(object, what) :
  tau is not a parameter in the object

怎么说我tau不是参数值呢?