Random Numbers (Graphing)
Using the nlsw88 data,
1. Simulate and then graph a theoretical log-normal distribution.
- Start by setting the seed to the same seed that we set when we simulated a normal distribution for
ttl_exp. - Next, create a variable called
wage_normthat has a normal distribution with mean 1.831 and standard deviation of 0.6615. - To make a log-normal distribution, we need to exponentiate
wage_normusing Stata’s built in math functionexp(). Call this new variablewage_logn. - Finally, draw the distribution of this new variable using
kdensity.
2. Graph wage and the log-normal distribution on same graph.
- Give the graph a descriptive title as well as labelling the x-axis and y-axis.
- Create a legend and place it below the graph (
pos) and in two columns (col). - Label the two lines as “Simulated log-normal” and “Observed wage”.