Update data.mdx

content/page/data.mdx

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 # Data and Methodology
+
+Store inclusions
+
+The Following NAICS were fully included:
+
+* '445110' - grocery stores
+* 452910 - warehouse stores
+* 455211 - warehouse stores
+* 452311 - warehouse stores
+
+These department stores under the NAICS code 452111 were included: WALMART SUPERCENTER,  TARGET,  and WALMART.
+
+For stats with dollar stores, the following business are included (DOLLAR GENERAL'",  "'FAMILY DOLLAR STORE'",  "'DOLLAR TREE'",  "'BIG LOTS'",  "'99 CENTS ONLY STORES'") under the NAICS categories of general merchandise stores (  '452990',  '455219',  '452319',)
+
+Sales scaling
+
+Not every store in our data selection sells exclusively, or even primarily, food items. To account for this, we scale the sales based on an estimated percent of category sales. Data for estimated category sales are listed below. for all other stores in non-grocery store NAICS classifications we estimate based on the average of available data: dollar stores (dollar general', 'dollar tree', 'family dollar', '99 cents only), warehouse stores ('costco', 'walmart') and department stores (target', 'big lots).
+
+* [https://www.statista.com/statistics/1113245/target-sales-by-product-segment-in-the-us/](https://www.statista.com/statistics/1113245/target-sales-by-product-segment-in-the-us/)
+* [https://www.statista.com/statistics/1222703/sales-of-dollar-tree-by-category-united-states-and-canada/](https://www.statista.com/statistics/1222703/sales-of-dollar-tree-by-category-united-states-and-canada/)
+* [https://www.statista.com/statistics/252678/walmarts-net-sales-in-the-us-by-merchandise-unit/](https://www.statista.com/statistics/252678/walmarts-net-sales-in-the-us-by-merchandise-unit/)
+* [https://www.statista.com/statistics/253589/share-of-dollar-generals-merchandise-sales-in-the-us-by-product-category/](https://www.statista.com/statistics/253589/share-of-dollar-generals-merchandise-sales-in-the-us-by-product-category/)
+* [https://www.statista.com/statistics/1222716/sales-of-family-dollar-by-category-united-states/](https://www.statista.com/statistics/1222716/sales-of-family-dollar-by-category-united-states/)
+* [https://www.statista.com/statistics/1222843/sales-big-lots-united-states-by-category/](https://www.statista.com/statistics/1222843/sales-big-lots-united-states-by-category/)
+* [https://www.statista.com/statistics/1018970/99-cents-only-store-product-category-sales-share-us/](https://www.statista.com/statistics/1018970/99-cents-only-store-product-category-sales-share-us/)
+* [https://www.statista.com/statistics/284423/sales-costco-worldwide-2011-2013-by-category/](https://www.statista.com/statistics/284423/sales-costco-worldwide-2011-2013-by-category/)
+*