sangyu · sangyu · Oct 16, 2025 · Sep 25, 2025 · Sep 25, 2025 · Oct 9, 2025
diff --git a/dabest/_delta_objects.py b/dabest/_delta_objects.py
@@ -435,17 +435,19 @@ def __init__(self, effectsizedataframe, permutation_count,
                                                  self.__control_N,
                                                  self.__test_var, 
                                                  self.__test_N)
+
+        self.__bootstraps_variance = ci2g.calculate_bootstraps_var(self.__bootstraps)
 
         # Compute the weighted average mean differences of the bootstrap data
         # using the pooled group variances of the raw data as the inverse of 
         # weights
         self.__bootstraps_weighted_delta = ci2g.calculate_weighted_delta(
-                                                          self.__group_var, 
+                                                          self.__bootstraps_variance, 
                                                           self.__bootstraps)
 
         # Compute the weighted average mean difference based on the raw data
         self.__difference = es.weighted_delta(np.array(self.__effsizedf["difference"]),
-                                                   self.__group_var)
+                                                   self.__bootstraps_variance)
 
         sorted_weighted_deltas = npsort(self.__bootstraps_weighted_delta)
 
@@ -753,6 +755,14 @@ def group_var(self):
         in order. 
         '''
         return self.__group_var
+
+    @property
+    def bootstraps_var(self):
+        '''
+        Return the variances of each bootstrapped mean difference distribution
+        in order. 
+        '''
+        return self.__bootstraps_variance
 
 
     @property

diff --git a/dabest/_modidx.py b/dabest/_modidx.py
@@ -27,6 +27,8 @@
                                                                                                                                           'dabest/_stats_tools/confint_2group_diff.py'),
                                                          'dabest._stats_tools.confint_2group_diff.bootstrap_indices': ( 'API/confint_2group_diff.html#bootstrap_indices',
                                                                                                                         'dabest/_stats_tools/confint_2group_diff.py'),
+                                                         'dabest._stats_tools.confint_2group_diff.calculate_bootstraps_var': ( 'API/confint_2group_diff.html#calculate_bootstraps_var',
+                                                                                                                               'dabest/_stats_tools/confint_2group_diff.py'),
                                                          'dabest._stats_tools.confint_2group_diff.calculate_group_var': ( 'API/confint_2group_diff.html#calculate_group_var',
                                                                                                                           'dabest/_stats_tools/confint_2group_diff.py'),
                                                          'dabest._stats_tools.confint_2group_diff.calculate_weighted_delta': ( 'API/confint_2group_diff.html#calculate_weighted_delta',

diff --git a/dabest/_stats_tools/confint_2group_diff.py b/dabest/_stats_tools/confint_2group_diff.py
@@ -6,7 +6,7 @@
 __all__ = ['create_jackknife_indexes', 'create_repeated_indexes', 'compute_meandiff_jackknife', 'bootstrap_indices',
            'compute_bootstrapped_diff', 'delta2_bootstrap_loop', 'compute_delta2_bootstrapped_diff',
            'compute_meandiff_bias_correction', 'compute_interval_limits', 'calculate_group_var',
-           'calculate_weighted_delta']
+           'calculate_bootstraps_var', 'calculate_weighted_delta']
 
 # %% ../../nbs/API/confint_2group_diff.ipynb 4
 import numpy as np
@@ -319,15 +319,23 @@ def calculate_group_var(control_var, control_N, test_var, test_N):
 
     return pooled_var
 
+def calculate_bootstraps_var(bootstraps):
 
-def calculate_weighted_delta(group_var, differences):
+    bootstraps_var_list = [np.var(x, ddof=1) for x in bootstraps]
+    bootstraps_var_array = np.array(bootstraps_var_list)
+
+    return bootstraps_var_array
+
+
+
+def calculate_weighted_delta(bootstrap_dist_var, differences):
     """
     Compute the weighted deltas.
     """
 
-    weight = 1 / group_var
+    weight = np.true_divide(1, bootstrap_dist_var)
     denom = np.sum(weight)
     num = 0.0
     for i in range(len(weight)):
         num += weight[i] * differences[i]
-    return num / denom
+    return np.true_divide(num, denom)
diff --git a/dabest/_stats_tools/effsize.py b/dabest/_stats_tools/effsize.py
@@ -392,11 +392,11 @@ def _compute_hedges_correction_factor(n1,
 
 # %% ../../nbs/API/effsize.ipynb 13
 @njit(cache=True)
-def weighted_delta(difference, group_var):
+def weighted_delta(difference, bootstrap_dist_var):
     '''
     Compute the weighted deltas where the weight is the inverse of the
     pooled group difference.
     '''
 
-    weight = np.true_divide(1, group_var)
+    weight = np.true_divide(1, bootstrap_dist_var)
     return np.sum(difference*weight)/np.sum(weight)
diff --git a/dabest/misc_tools.py b/dabest/misc_tools.py
@@ -937,7 +937,7 @@ def initialize_fig(
     raw_label = plot_kwargs["raw_label"]
     if raw_label is None:
         if proportional:
-            raw_label = "Proportion of Success" if effect_size_type != "cohens_h" else "Value"
+            raw_label = "Proportion of success" if effect_size_type != "cohens_h" else "Value"
         else:
             raw_label = yvar 
 
@@ -951,16 +951,16 @@ def initialize_fig(
 
     # Set contrast axes y-label.
     contrast_label_dict = {
-        "mean_diff": "Mean Difference",
-        "median_diff": "Median Difference",
+        "mean_diff": "Mean difference",
+        "median_diff": "Median difference",
         "cohens_d": "Cohen's d",
         "hedges_g": "Hedges' g",
         "cliffs_delta": "Cliff's delta",
         "cohens_h": "Cohen's h",
     }
 
     if proportional and effect_size_type != "cohens_h":
-        default_contrast_label = "Proportion Difference"
+        default_contrast_label = "Proportion difference"
     else:
         default_contrast_label = contrast_label_dict[effect_size_type]
 

diff --git a/dabest/plot_tools.py b/dabest/plot_tools.py
@@ -1333,31 +1333,31 @@ def extract_curve_data(dabest_object):
     if horizontal:
         current_ylabels = rawdata_axes.get_yticklabels()
         if type == 'mini_meta':
-            current_ylabels.extend(["Weighted Delta"])
+            current_ylabels.extend(["Weighted delta"])
         elif effect_size == "hedges_g":
             current_ylabels.extend(["Delta g"])
         else:
-            current_ylabels.extend(["Delta-Delta"])
+            current_ylabels.extend(["Delta-delta"])
 
         rawdata_axes.set_yticks(np.append(rawdata_axes.get_yticks(), position))
         rawdata_axes.set_yticklabels(current_ylabels)
     else:
         if type == 'mini_meta':
             if show_pairs:
-                contrast_xtick_labels.extend(["Weighted\n Delta"])
+                contrast_xtick_labels.extend(["Weighted\n delta"])
             else:
-                contrast_xtick_labels.extend(["Weighted Delta"])
+                contrast_xtick_labels.extend(["Weighted delta"])
         elif effect_size == "hedges_g":
             contrast_xtick_labels.extend(["Delta g"])
         else:
-            contrast_xtick_labels.extend(["Delta-Delta"])
+            contrast_xtick_labels.extend(["Delta-delta"])
 
     # Create the delta-delta axes.
     if type == 'delta_delta' and not horizontal:
         if plot_kwargs["delta2_label"] is not None:
             delta2_label = plot_kwargs["delta2_label"]
         elif effect_size == "mean_diff":
-            delta2_label = "Delta-Delta"
+            delta2_label = "Delta-delta"
         else:
             delta2_label = "Delta g"
         fontsize_delta2label = plot_kwargs["fontsize_delta2label"]

diff --git a/nbs/API/confint_2group_diff.ipynb b/nbs/API/confint_2group_diff.ipynb
@@ -373,18 +373,26 @@
     "    \n",
     "    return pooled_var\n",
     "\n",
+    "def calculate_bootstraps_var(bootstraps):\n",
     "\n",
-    "def calculate_weighted_delta(group_var, differences):\n",
+    "    bootstraps_var_list = [np.var(x, ddof=1) for x in bootstraps]\n",
+    "    bootstraps_var_array = np.array(bootstraps_var_list)\n",
+    "    \n",
+    "    return bootstraps_var_array\n",
+    "    \n",
+    "\n",
+    "\n",
+    "def calculate_weighted_delta(bootstrap_dist_var, differences):\n",
     "    \"\"\"\n",
     "    Compute the weighted deltas.\n",
     "    \"\"\"\n",
     "\n",
-    "    weight = 1 / group_var\n",
+    "    weight = np.true_divide(1, bootstrap_dist_var)\n",
     "    denom = np.sum(weight)\n",
     "    num = 0.0\n",
     "    for i in range(len(weight)):\n",
     "        num += weight[i] * differences[i]\n",
-    "    return num / denom"
+    "    return np.true_divide(num, denom)"
    ]
   }
  ],

diff --git a/nbs/API/delta_objects.ipynb b/nbs/API/delta_objects.ipynb
diff --git a/nbs/API/effsize.ipynb b/nbs/API/effsize.ipynb
@@ -507,13 +507,13 @@
    "source": [
     "#| export\n",
     "@njit(cache=True)\n",
-    "def weighted_delta(difference, group_var):\n",
+    "def weighted_delta(difference, bootstrap_dist_var):\n",
     "    '''\n",
     "    Compute the weighted deltas where the weight is the inverse of the\n",
     "    pooled group difference.\n",
     "    '''\n",
     "\n",
-    "    weight = np.true_divide(1, group_var)\n",
+    "    weight = np.true_divide(1, bootstrap_dist_var)\n",
     "    return np.sum(difference*weight)/np.sum(weight)"
    ]
   }

diff --git a/nbs/API/effsize_objects.ipynb b/nbs/API/effsize_objects.ipynb
@@ -2403,5 +2403,5 @@
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }
diff --git a/nbs/API/misc_tools.ipynb b/nbs/API/misc_tools.ipynb
@@ -990,7 +990,7 @@
     "    raw_label = plot_kwargs[\"raw_label\"]\n",
     "    if raw_label is None:\n",
     "        if proportional:\n",
-    "            raw_label = \"Proportion of Success\" if effect_size_type != \"cohens_h\" else \"Value\"\n",
+    "            raw_label = \"Proportion of success\" if effect_size_type != \"cohens_h\" else \"Value\"\n",
     "        else:\n",
     "            raw_label = yvar \n",
     "\n",
@@ -1004,16 +1004,16 @@
     "\n",
     "    # Set contrast axes y-label.\n",
     "    contrast_label_dict = {\n",
-    "        \"mean_diff\": \"Mean Difference\",\n",
-    "        \"median_diff\": \"Median Difference\",\n",
+    "        \"mean_diff\": \"Mean difference\",\n",
+    "        \"median_diff\": \"Median difference\",\n",
     "        \"cohens_d\": \"Cohen's d\",\n",
     "        \"hedges_g\": \"Hedges' g\",\n",
     "        \"cliffs_delta\": \"Cliff's delta\",\n",
     "        \"cohens_h\": \"Cohen's h\",\n",
     "    }\n",
     "\n",
     "    if proportional and effect_size_type != \"cohens_h\":\n",
-    "        default_contrast_label = \"Proportion Difference\"\n",
+    "        default_contrast_label = \"Proportion difference\"\n",
     "    else:\n",
     "        default_contrast_label = contrast_label_dict[effect_size_type]\n",
     "\n",

diff --git a/nbs/API/plot_tools.ipynb b/nbs/API/plot_tools.ipynb
@@ -1384,31 +1384,31 @@
     "    if horizontal:\n",
     "        current_ylabels = rawdata_axes.get_yticklabels()\n",
     "        if type == 'mini_meta':\n",
-    "            current_ylabels.extend([\"Weighted Delta\"])\n",
+    "            current_ylabels.extend([\"Weighted delta\"])\n",
     "        elif effect_size == \"hedges_g\":\n",
     "            current_ylabels.extend([\"Delta g\"])\n",
     "        else:\n",
-    "            current_ylabels.extend([\"Delta-Delta\"])\n",
+    "            current_ylabels.extend([\"Delta-delta\"])\n",
     "\n",
     "        rawdata_axes.set_yticks(np.append(rawdata_axes.get_yticks(), position))\n",
     "        rawdata_axes.set_yticklabels(current_ylabels)\n",
     "    else:\n",
     "        if type == 'mini_meta':\n",
     "            if show_pairs:\n",
-    "                contrast_xtick_labels.extend([\"Weighted\\n Delta\"])\n",
+    "                contrast_xtick_labels.extend([\"Weighted\\n delta\"])\n",
     "            else:\n",
-    "                contrast_xtick_labels.extend([\"Weighted Delta\"])\n",
+    "                contrast_xtick_labels.extend([\"Weighted delta\"])\n",
     "        elif effect_size == \"hedges_g\":\n",
     "            contrast_xtick_labels.extend([\"Delta g\"])\n",
     "        else:\n",
-    "            contrast_xtick_labels.extend([\"Delta-Delta\"])\n",
+    "            contrast_xtick_labels.extend([\"Delta-delta\"])\n",
     "\n",
     "    # Create the delta-delta axes.\n",
     "    if type == 'delta_delta' and not horizontal:\n",
     "        if plot_kwargs[\"delta2_label\"] is not None:\n",
     "            delta2_label = plot_kwargs[\"delta2_label\"]\n",
     "        elif effect_size == \"mean_diff\":\n",
-    "            delta2_label = \"Delta-Delta\"\n",
+    "            delta2_label = \"Delta-delta\"\n",
     "        else:\n",
     "            delta2_label = \"Delta g\"\n",
     "        fontsize_delta2label = plot_kwargs[\"fontsize_delta2label\"]\n",

diff --git a/...ts/mpl_image_tests/baseline_images/test_01_gardner_altman_unpaired_meandiff.png b/...ts/mpl_image_tests/baseline_images/test_01_gardner_altman_unpaired_meandiff.png
diff --git a/.../mpl_image_tests/baseline_images/test_02_gardner_altman_unpaired_mediandiff.png b/.../mpl_image_tests/baseline_images/test_02_gardner_altman_unpaired_mediandiff.png
diff --git a/...ests/mpl_image_tests/baseline_images/test_04_gardner_altman_paired_meandiff.png b/...ests/mpl_image_tests/baseline_images/test_04_gardner_altman_paired_meandiff.png
diff --git a/...pl_image_tests/baseline_images/test_05_cummings_two_group_unpaired_meandiff.png b/...pl_image_tests/baseline_images/test_05_cummings_two_group_unpaired_meandiff.png
diff --git a/.../mpl_image_tests/baseline_images/test_06_cummings_two_group_paired_meandiff.png b/.../mpl_image_tests/baseline_images/test_06_cummings_two_group_paired_meandiff.png
diff --git a/...tests/mpl_image_tests/baseline_images/test_07_cummings_multi_group_unpaired.png b/...tests/mpl_image_tests/baseline_images/test_07_cummings_multi_group_unpaired.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_08_cummings_multi_group_paired.png b/nbs/tests/mpl_image_tests/baseline_images/test_08_cummings_multi_group_paired.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_09_cummings_shared_control.png b/nbs/tests/mpl_image_tests/baseline_images/test_09_cummings_shared_control.png
diff --git a/...s/mpl_image_tests/baseline_images/test_101_gardner_altman_unpaired_propdiff.png b/...s/mpl_image_tests/baseline_images/test_101_gardner_altman_unpaired_propdiff.png
diff --git a/...l_image_tests/baseline_images/test_103_cummings_two_group_unpaired_propdiff.png b/...l_image_tests/baseline_images/test_103_cummings_two_group_unpaired_propdiff.png
diff --git a/...image_tests/baseline_images/test_105_cummings_multi_group_unpaired_propdiff.png b/...image_tests/baseline_images/test_105_cummings_multi_group_unpaired_propdiff.png
diff --git a/...s/mpl_image_tests/baseline_images/test_106_cummings_shared_control_propdiff.png b/...s/mpl_image_tests/baseline_images/test_106_cummings_shared_control_propdiff.png
diff --git a/...sts/mpl_image_tests/baseline_images/test_107_cummings_multi_groups_propdiff.png b/...sts/mpl_image_tests/baseline_images/test_107_cummings_multi_groups_propdiff.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_10_cummings_multi_groups.png b/nbs/tests/mpl_image_tests/baseline_images/test_10_cummings_multi_groups.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_110_change_fig_size.png b/nbs/tests/mpl_image_tests/baseline_images/test_110_change_fig_size.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_111_change_palette_b.png b/nbs/tests/mpl_image_tests/baseline_images/test_111_change_palette_b.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_112_change_palette_c.png b/nbs/tests/mpl_image_tests/baseline_images/test_112_change_palette_c.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_113_desat.png b/nbs/tests/mpl_image_tests/baseline_images/test_113_desat.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_114_change_ylims.png b/nbs/tests/mpl_image_tests/baseline_images/test_114_change_ylims.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_115_invert_ylim.png b/nbs/tests/mpl_image_tests/baseline_images/test_115_invert_ylim.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_116_ticker_gardner_altman.png b/nbs/tests/mpl_image_tests/baseline_images/test_116_ticker_gardner_altman.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_117_err_color.png b/nbs/tests/mpl_image_tests/baseline_images/test_117_err_color.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_119_wide_df_nan.png b/nbs/tests/mpl_image_tests/baseline_images/test_119_wide_df_nan.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_11_inset_plots.png b/nbs/tests/mpl_image_tests/baseline_images/test_11_inset_plots.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_120_long_df_nan.png b/nbs/tests/mpl_image_tests/baseline_images/test_120_long_df_nan.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_123_sankey_gardner_altman.png b/nbs/tests/mpl_image_tests/baseline_images/test_123_sankey_gardner_altman.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_125_sankey_2paired_groups.png b/nbs/tests/mpl_image_tests/baseline_images/test_125_sankey_2paired_groups.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_126_sankey_2sequential_groups.png b/nbs/tests/mpl_image_tests/baseline_images/test_126_sankey_2sequential_groups.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_127_sankey_multi_group_paired.png b/nbs/tests/mpl_image_tests/baseline_images/test_127_sankey_multi_group_paired.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_128_sankey_transparency.png b/nbs/tests/mpl_image_tests/baseline_images/test_128_sankey_transparency.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_129_zero_to_zero.png b/nbs/tests/mpl_image_tests/baseline_images/test_129_zero_to_zero.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_130_zero_to_one.png b/nbs/tests/mpl_image_tests/baseline_images/test_130_zero_to_one.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_131_one_to_zero.png b/nbs/tests/mpl_image_tests/baseline_images/test_131_one_to_zero.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_132_shared_control_sankey_off.png b/nbs/tests/mpl_image_tests/baseline_images/test_132_shared_control_sankey_off.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_133_shared_control_flow_off.png b/nbs/tests/mpl_image_tests/baseline_images/test_133_shared_control_flow_off.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_134_separate_control_sankey_off.png b/nbs/tests/mpl_image_tests/baseline_images/test_134_separate_control_sankey_off.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_135_separate_control_flow_off.png b/nbs/tests/mpl_image_tests/baseline_images/test_135_separate_control_flow_off.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_136_style_sheets.png b/nbs/tests/mpl_image_tests/baseline_images/test_136_style_sheets.png
diff --git a/...ts/mpl_image_tests/baseline_images/test_137_multi_2group_show_sample_counts.png b/...ts/mpl_image_tests/baseline_images/test_137_multi_2group_show_sample_counts.png
diff --git a/...image_tests/baseline_images/test_138_multi_groups_paired_show_sample_counts.png b/...image_tests/baseline_images/test_138_multi_groups_paired_show_sample_counts.png
diff --git a/...e_tests/baseline_images/test_139_multi_2group_show_sample_counts_and_kwargs.png b/...e_tests/baseline_images/test_139_multi_2group_show_sample_counts_and_kwargs.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_13_multi_2group_color.png b/nbs/tests/mpl_image_tests/baseline_images/test_13_multi_2group_color.png
diff --git a/...line_images/test_140_multi_groups_paired_show_sample_counts_with_sankey_off.png b/...line_images/test_140_multi_groups_paired_show_sample_counts_with_sankey_off.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_141_sankey_change_palette_a.png b/nbs/tests/mpl_image_tests/baseline_images/test_141_sankey_change_palette_a.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_142_sankey_change_palette_b.png b/nbs/tests/mpl_image_tests/baseline_images/test_142_sankey_change_palette_b.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_143_sankey_change_palette_c.png b/nbs/tests/mpl_image_tests/baseline_images/test_143_sankey_change_palette_c.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_144_change_palette_d.png b/nbs/tests/mpl_image_tests/baseline_images/test_144_change_palette_d.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_14_gardner_altman_paired_color.png b/nbs/tests/mpl_image_tests/baseline_images/test_14_gardner_altman_paired_color.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_15_change_palette_a.png b/nbs/tests/mpl_image_tests/baseline_images/test_15_change_palette_a.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_16_change_palette_b.png b/nbs/tests/mpl_image_tests/baseline_images/test_16_change_palette_b.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_17_change_palette_c.png b/nbs/tests/mpl_image_tests/baseline_images/test_17_change_palette_c.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_18_desat.png b/nbs/tests/mpl_image_tests/baseline_images/test_18_desat.png
diff --git a/nbs/tests/mpl_image_tests/baseline_images/test_19_dot_sizes.png b/nbs/tests/mpl_image_tests/baseline_images/test_19_dot_sizes.png
diff --git a/...l_image_tests/baseline_images/test_207_gardner_altman_meandiff_empty_circle.png b/...l_image_tests/baseline_images/test_207_gardner_altman_meandiff_empty_circle.png
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