added readme.md

Author: Skeftical

README.md

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+# Explaining Aggregate for Large-Scale Data Exploration
+
+This is a repository to accompany paper : [*Explaining Aggregates for Exploratory Analytics*](https://arxiv.org/abs/1812.11346)
+
+![alt text](https://i.imgur.com/EI1aMBo.png)
+
+The goal is to build regression functions that can explain how aggregates (such as AVG/COUNT/SUM) change with respect to different 
+inputs. By treating the aggregate functions used in SQL queries as black box functions we approximate their behavior using well-known 
+regression functions and observations (ie past executed queries). This is shown in the figure above.
+
+We can then used these local regression functions to explain data subspaces that indicate which regions in a data set might be more important.
+
+![alt text](https://i.imgur.com/sWP0NnX.png)