Storing Results as Numbers (Macros)

Here you will practice storing regression output in scalars and using them later.

1. Run a regression of yield (yield_kg) on fertilizer (nitrogen_kg) and plot characteristics (plot_area_GPS irrigated). Using the e() objects, store the R-squared and the number of observations from this regression in scalars named rsq_yield and N_yield. Using display, what are the R-squared value and number of observations?

2. Immediately after, run the same regression but with harvest_value_USD as the dependent variable instead of yield_kg This will overwrite e(r2) and e(N). Store the R-squared from the second regression in a local macro named rsq_harv. Using display, what is the R-squared value?

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