Integrated survival metrics should warn when used with a single time point in eval_time

[hfrick]

library(censored)
#> Loading required package: parsnip
#> Loading required package: survival
library(yardstick)

lung_surv <- lung %>% 
  dplyr::mutate(surv = Surv(time, status), .keep = "unused")

cox <- proportional_hazards() %>% 
  fit(surv ~ ., data = lung_surv)

pred <- augment(cox, lung_surv, eval_time = 10)

brier_survival_integrated(
  data = pred,
  truth = surv,
  .pred
)
#> # A tibble: 1 × 3
#>   .metric                   .estimator .estimate
#>   <chr>                     <chr>          <dbl>
#> 1 brier_survival_integrated standard           0

^{Created on 2023-11-22 with reprex v2.0.2}

[topepo]

After discussing during the tidymodels meeting, we should error if an integrated metric is used with <2 times. The more generic code that tune uses is

 cli::cli_abort("At least {max_times_req} evaluation time{?s} {?is/are}
                   required for the metric type(s) requested: {.val {uni_cls}}.
                   Only {num_times} unique time{?s} {?was/were} given.",
                   call = call)

You can use a more simplistic version of this.

[github-actions]

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