Running examples in ‘arm-Ex.R’ failed
The error most likely occurred in:

> ### Name: display
> ### Title: Functions for Processing lm, glm, mer, polr and svyglm Output
> ### Aliases: display display,lm-method display,bayesglm-method
> ###   display,glm-method display,merMod-method display,polr-method
> ###   display,svyglm-method
> ### Keywords: manip methods
> 
> ### ** Examples
>                           
> # Here's a simple example of a model of the form, y = a + bx + error, 
> # with 10 observations in each of 10 groups, and with both the 
> # intercept and the slope varying by group.  First we set up the model and data.
>    group <- rep(1:10, rep(10,10))
>    group2 <- rep(1:10, 10)
>    mu.a <- 0
>    sigma.a <- 2
>    mu.b <- 3
>    sigma.b <- 4
>    rho <- 0.56
>    Sigma.ab <- array (c(sigma.a^2, rho*sigma.a*sigma.b, 
+                     rho*sigma.a*sigma.b, sigma.b^2), c(2,2))
>    sigma.y <- 1
>    ab <- mvrnorm (10, c(mu.a,mu.b), Sigma.ab)
>    a <- ab[,1]
>    b <- ab[,2]
>    d <- rnorm(10)
> 
>    x <- rnorm (100)
>    y1 <- rnorm (100, a[group] + b*x, sigma.y)
>    y2 <- rbinom(100, 1, prob=invlogit(a[group] + b*x))
>    y3 <- rnorm (100, a[group] + b[group]*x + d[group2], sigma.y)
>    y4 <- rbinom(100, 1, prob=invlogit(a[group] + b*x + d[group2]))
> 
> 
> # display a simple linear model
> 
>    M1 <- lm (y1 ~ x)
>    display (M1)
lm(formula = y1 ~ x)
            coef.est coef.se
(Intercept) -0.89     0.33  
x            3.73     0.39  
---
n = 100, k = 2
residual sd = 3.26, R-Squared = 0.49
>    M1.sim <- sim(M1, n.sims=2)  
> 
> # display a simple logit model
> 
>    M2 <- glm (y2 ~ x, family=binomial(link="logit"))
>    display (M2)
glm(formula = y2 ~ x, family = binomial(link = "logit"))
            coef.est coef.se
(Intercept) -0.48     0.23  
x            1.09     0.30  
---
  n = 100, k = 2
  residual deviance = 119.6, null deviance = 136.1 (difference = 16.4)
>    M2.sim <- sim(M2, n.sims=2)  
> 
> # Then fit and display a simple varying-intercept model:
>  
>    M3 <- lmer (y1 ~ x + (1|group))
>    display (M3)
lmer(formula = y1 ~ x + (1 | group))
            coef.est coef.se
(Intercept) -0.86     0.72  
x            3.43     0.31  

Error terms:
Error in tcrossprod(sc * Li) : "tcrossprod" is not a BUILTIN function
Calls: display ... VarCorr.merMod -> structure -> mkVarCorr -> lapply -> FUN
Execution halted