Here are some examples of R examples that I use in class teaching econometrics.
Some materials in html format:
Cross-Sectional Data:
L2-Simple Regression Assumptions and R2
L3-Multiple Regression-Exercise
L3-Multiple Regression-Confidence Intervals & Prediction
L3-Multiple Regression-Qualitative Data (Dummy Variables)
L3-Multiple Regression-Logit Models
Time Series Data: