# Statistics (excel) – cpi and s&p 500 index | ECO 342 Principles of Econometrics | Ashford University

2.12. Table 2-9 gives data on the Consumer Price Index (CPI) for all items (1982-1984 = 100) and the Standard and Poor’s (S&P) index of 500 common stock prices (base of index: 1941-1943 = 10).

1. Plot the data on a scattergram with the S&P index on the vertical axis and CPI on the horizontal axis.
3. Consider the following regression model:  (S&P)t = B1 + B2CPIt + ut
• Use the method of least squares to estimate this equation from the preceding data and interpret your results.
4. Do the results obtained in part (c) make economic sense?
5. Do you know why the S&P index dropped in 1988?

The following things are some of those you want to be sure are included on and in your graphics:

·        Title:                       What does this graph represent?

·        Axis Labels:            What is the independent (x-axis) and dependent variable (y-axis)?

·        Axis Values:           Generally, years are things like 2007 and not something like 6

·        Functionality:          Remember, the dependent variable always goes on the y-axis!

·        Organization:          Series with wildly different y-axis values generally speaking should not be graphed on the same graph, otherwise the ability to see variability and relationships in the data is lost. For instance on 1.6a, the S&P500 index ranges from 0–1500 and the T-Bill yield ranged from 0-14: these do not belong on the same graph.

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