add links for pandas date offsets

mikofski · mikofski · commit bc5c0526fa73 · 2021-06-18T15:17:31.000-07:00
diff --git a/Tutorial 1 - TMY Weather Data.ipynb b/Tutorial 1 - TMY Weather Data.ipynb
@@ -51,7 +51,8 @@
     "- Exploring a Pandas dataframe (`df`): `len()`, `df.head()`, `df.keys()`\n",
     "- [pvlib input-output tools](https://pvlib-python.readthedocs.io/en/stable/api.html#io-tools)\n",
     "- Ploting a Pandas dataframe (`df`): `df.plot()`\n",
-    "- Aggregating data in a dataframe (`df`): `df.resample(freq).sum()`\n",
+    "- Aggregating data in a dataframe (`df`): [`df.resample(freq).sum()`](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.resample.html)\n",
+    "- Pandas [`DateOffsets`](https://pandas.pydata.org/pandas-docs/stable/user_guide/timeseries.html#dateoffset-objects) - shortcuts to set the frequency when resampling\n",
     "- Getting NREL irradiance data from the web based API using pvlib"
    ]
   },
@@ -1205,7 +1206,7 @@
    "source": [
     "## Aggregating hourly data to monthly summaries\n",
     "\n",
-    "Pandas makes it easy to roll-up timeseries data into summary values.  For example, we can calculate total monthly GHI as a quick way to visualize the seasonality of solar resource:"
+    "Pandas makes it easy to roll-up timeseries data into summary values. We can use the [`DataFrame.resample()`](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.resample.html) function with [`DateOffsets`](https://pandas.pydata.org/pandas-docs/stable/user_guide/timeseries.html#dateoffset-objects) like `'M'` for months.  For example, we can calculate total monthly GHI as a quick way to visualize the seasonality of solar resource:"
    ]
   },
   {
@@ -1544,7 +1545,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.3"
+   "version": "3.7.10"
   }
  },
  "nbformat": 4,
