1. Using the elemapi2 data file ( use https://stats.idre.ucla.edu/stat/stata/webbooks/reg/elemapi2
) convert the variable ell into 2 categories using the
following coding, 0-25 on ell becomes 0, and 26-100 on ell
becomes 1. Use this recoded version of ell to predict api00
and interpret the results.
2. Convert the variable ell into 3 categories coding those
scoring 0-14 on ell as 1, and those 15/41 as 2 and 42/100 as 3. Do an analysis
predicting api00 from the ell variable
converted to a 1/2/3 variable. Interpret the results.
3. Do a regression analysis predicting api00 from yr_rnd
and the ell variable converted to a 0/1 variable. Then create
an interaction term and run the analysis again. Interpret the results of these
analyses.
4. Do a regression analysis predicting api00 from ell
coded as 0/1 (from question 1) and some_col, and the
interaction of these two variables. Interpret the results, including showing a
graph of the results.
5. Use the variable ell converted into 3 categories (from
question 2) and predict api00 from ell in 3 categories, from some_col
and the interaction. of these two variables. Interpret the results, including
showing a graph.