diff --git a/specparam/core/strings.py b/specparam/core/strings.py
index 01962822..8d2e8d21 100644
--- a/specparam/core/strings.py
+++ b/specparam/core/strings.py
@@ -4,6 +4,7 @@
 
 from specparam.core.errors import NoModelError
 from specparam.data.utils import get_periodic_labels
+from specparam.utils.data import compute_presence
 from specparam.version import __version__ as MODULE_VERSION
 
 ###################################################################################################
diff --git a/specparam/utils/data.py b/specparam/utils/data.py
index 181bab0f..b7759896 100644
--- a/specparam/utils/data.py
+++ b/specparam/utils/data.py
@@ -108,15 +108,11 @@ def compute_presence(data, average=False, output='ratio'):
 
     assert output in ['ratio', 'percent'], 'Setting for output type not understood.'
 
-    if data.ndim == 1:
-        presence = sum(~np.isnan(data)) / len(data)
+    if data.ndim == 1 or average:
+        presence = np.sum(~np.isnan(data)) / data.size
 
     elif data.ndim == 2:
-        if average:
-            presence = compute_presence(data.flatten())
-        else:
-            n_events, n_windows = data.shape
-            presence = np.sum(~np.isnan(data), 0) / (np.ones(n_windows) * n_events)
+        presence = np.sum(~np.isnan(data), 0) / (np.ones(data.shape[1]) * data.shape[0])
 
     if output == 'percent':
         presence *= 100