R Under development (unstable) (2023-08-27 r85021 ucrt) -- "Unsuffered Consequences"
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> 
> set.seed(290875)
> 
> ret <- TRUE
> 
> if (require("rms") && require("tram")) {
+ 
+     x <- runif(2000)
+     y <- round(rnorm(length(x), mean = 2 * x, sd = .25), 1)
+     d <- data.frame(y = y, x = x)
+     d$Ry <- with(d, R(y, as.R.ordered = TRUE))
+ 
+     mP <- Polr(Ry ~ x, data = d)
+     mM <- Polr(Ry ~ x, data = d, sparse_nlevels = 2)
+     mO <- orm(y ~ x, data = d)
+ 
+     tol <- 1e-4
+     ret <- 
+       isTRUE(all.equal(coef(mP), coef(mM), tol = tol)) && 
+       isTRUE(all.equal(coef(mP), coef(mO)["x"], tol = tol)) && 
+       isTRUE(all.equal(coef(as.mlt(mP)), coef(as.mlt(mM)), tol = tol)) &&
+       isTRUE(all.equal(rev(coef(as.mlt(mP)))[-1L], 
+                        -rev(coef(mO))[-1L], tol = tol, 
+                        check.attributes = FALSE)) &&
+       isTRUE(all.equal(logLik(mP), logLik(mM), tol = tol)) &&
+       isTRUE(all.equal(c(logLik(mP)), c(logLik(mO)), tol = tol)) &&
+ 
+       isTRUE(all.equal(c(vcov(mP)), as.numeric(vcov(mM)), tol = tol)) &&
+       isTRUE(all.equal(c(vcov(mP)), vcov(mO)["x", "x"], tol = tol))
+ 
+ }
Loading required package: rms
Loading required package: Hmisc

Attaching package: 'Hmisc'

The following objects are masked from 'package:base':

    format.pval, units

Loading required package: tram
Loading required package: mlt
Loading required package: basefun
Loading required package: variables
Loading required package: mvtnorm
> 
> ret
[1] TRUE
> 
> proc.time()
   user  system elapsed 
  12.31    2.23   14.53