1. Economics Data and Math 1

2.  Playing with variables and numbers  Index  Absolute vs relative  Index = number  No units  No units = unit A / unit A  Constructing an index  Base value  Current value  Index = current value / base value  Complex indeces  Weighted averages 2

3.  Data and Visuals  Cross-section data  Bar graph  Time series  Time plot  Relationship / association  Scatter diagram 3

4.  Relationship / association  Function  Verbal (words)  Schedule (table)  Equation (variables + Math)  Visuals (graph)  Dependent/independent variables  In function  In theory  Functional form  Linear  Non-linear 4

5.  Slope of a function  Linear  Non-linear  Slope of a function = (another) function  Function with an extremum  Maximum  Minimum  Important classes  Mathematical function  Statistical function 5

6.  Prominent examples  Production function  Slope = marginal product  Cost function  Slope = marginal cost  Average cost  Minimum AC  Profit function  Consumption function  Math/model  Statistics 6