R Under development (unstable) (2026-02-23 r89457 ucrt) -- "Unsuffered Consequences"
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> ## predict.svyglm with rank-deficient model
> ## from Terry Therneau, 6/24
> 
> load("sdata2.rda") 
> library(survival)
> library(survey)
Loading required package: grid
Loading required package: Matrix

Attaching package: 'survey'

The following object is masked from 'package:graphics':

    dotchart

> 
> pfit2 <- svyglm(pseudo ~ trt + flt3 + factor(time), design= sdata2)
> pfit3 <- svyglm(pseudo ~ trt + flt3 + factor(time), design=sdata2,
+                 family= gaussian(link= blog()))
> pfit2b <- update(pfit2, . ~ . + flt3:time)
> pfit3b <- update(pfit3, . ~ . + flt3:time)
> dummy <- expand.grid(trt=c("A", "B"), flt3= LETTERS[1:3], time=24* 1:3)
> 
> phat2b <- predict(pfit2b, newdata=dummy, type='response',se.fit=FALSE)
> phat3b <- predict(pfit3b, newdata=dummy, type='response',se.fit=TRUE)
> 
> stopifnot(class(phat2b)=="numeric")
> stopifnot(class(phat3b)=="svystat")
> 
> stopifnot(all.equal(as.vector(coef(phat3b))[1],12.3296615700191))
> stopifnot(all.equal(as.vector(phat2b)[1], 11.4568358310328))
> 
> proc.time()
   user  system elapsed 
   1.15    0.10    1.25