Question 4

The world bank zip file (WDI_EXCEL) contains information on a wide range of countries, and there are around 370,000 rows of data. Big cross-country data sets like this are updated less frequently than country level data, but they allow a range of comparisons to be made. For Australia and New Zealand find the data for the data for: "Methane emissions (kt of CO2 equivalent)". The data will run from 1990 to 2020 (inclusive). Note that the individual country data is indexed alphabetically.

Use a regression model with Time (Year) as the explanatory variable and the log of Methane emissions (kt of CO2 equivalent) as the dependent variable and select the appropriate responses for Question 4. The specific question you will need to answer are as follows:

Whether emissions in Australia and New Zealand have reduced/increased/not changed over the sample period.

Whether or not emission changed faster in one country compared to the other (defined by the difference in the slopes).

Whether emissions are higher in Australia or New Zealand (defined by the difference in the intercepts).

Whether or not there is evidence of within group autocorrelation.

Whether or not there is evidence of heteroskedasticty.

solve using R