fix point_estimate mode (#1552)

Co-authored-by: Oriol (ZBook) <oriol.abril.pla@gmail.com>

CHANGELOG.md

@@ -2,15 +2,15 @@
 
 ## v0.x.x Unreleased
 ### New features
-* Added `to_zarr` method to InferenceData
-* Added `from_zarr` method to InferenceData
-* Added confidence interval band to auto-correlation plot ([1535](https://github.com/arviz-devs/arviz/pull/1535)) 
+* Added `to_zarr` and `from_zarr` methods to InferenceData ([1518](https://github.com/arviz-devs/arviz/pull/1535))
+* Added confidence interval band to auto-correlation plot ([1535](https://github.com/arviz-devs/arviz/pull/1535))
 
 ### Maintenance and fixes
 * Updated `from_cmdstan` and `from_numpyro` converter to follow schema convention ([1541](https://github.com/arviz-devs/arviz/pull/1541) and [1525](https://github.com/arviz-devs/arviz/pull/1525))
+* Fix calculation of mode as point estimate ([1552](https://github.com/arviz-devs/arviz/pull/1552))
 
 ### Deprecation
-* Removed Geweke diagnostic ([1545](https://github.com/arviz-devs/arviz/pull/1545)) 
+* Removed Geweke diagnostic ([1545](https://github.com/arviz-devs/arviz/pull/1545))
 
 ### Documentation
 

arviz/plots/plot_utils.py

@@ -586,7 +586,7 @@ def calculate_point_estimate(point_estimate, values, bw="default", circular=Fals
         else:
             point_value = np.mean(values)
     elif point_estimate == "mode":
-        if isinstance(values[0], float):
+        if values.dtype.kind == "f":
             if bw == "default":
                 if circular:
                     bw = "taylor"