## rmst_diff()


Compute RMST difference between two groups with confidence interval.


Usage

``` python
rmst_diff(
    surv,
    tau,
    group,
    *,
    strata=None,
    conf_level=0.95,
)
```


Convenience function that calls [rmst_test()](rmst_test.md#greenwood.rmst_test) with `estimand="difference"` and returns a DataFrame with the comparison results.


## Parameters


`surv: Surv`  
A right-censored [Surv](Surv.md#greenwood.Surv) response.

`tau: float`  
The restriction time.

`group: Any`  
Group membership.

`strata: Any | None = None`  
(Optional) Stratification variable.

`conf_level: float = ``0.95`  
Confidence level for intervals.


## Returns


`DataFrame or dict`  
Comparison results in tabular format.