allow using collection of dataframes for PdfDistributionPlot

quickstats/maths/statistics.py

@@ -212,7 +212,7 @@ def get_hist_data(x:np.ndarray, weights:Optional[np.ndarray]=None,
             pois_interval = get_poisson_interval(_y)
             yerr =  (pois_interval["lo"] / size, pois_interval["hi"] / size)
             _weights = weights / size
-            y, bin_edges = np.histogram(x, bins=bins, range=brange, weights=_weights)
+            y, bin_edges = np.histogram(x, bins=bins, range=range, weights=_weights)
         elif error_method == "sumw2":
             _y, bin_edges = np.histogram(x, bins=bins, range=range, weights=weights**2)
             _weights = weights / size