If you are downloading this SHAZAM code for use on your own computer, select "File", then "Save As...", and save on your own diskette (a:) or your own hard drive (c:\) using the same filename e143sh4.sha.

IMPORTANT: you must then use an editor (like TED) to delete all of the HTML code from the top and the bottom of the file, leaving only the SHAZAM code. The line which reads "* SHAZAM code (e143sh4.sha) downloaded from UCLA Econ 143 (CAMERON) WebSite" should be the first line of your edited program file. Save the edited program as study.sha

* SHAZAM code downloaded from UCLA Econ 143 (CAMERON) WebSite: 
* HTML file called e143sh4.htm, and should have 
*  been downloaded as study.sha

* example of omitted variables bias:  study time and midterm grade
* midterm=percent score on midterm exam
* study=hours spent studying for midterm in week before exam
* gpa=proxy for quality of advance preparation for coursework

sample 1 13
read midterm study gpa
95 2 4.0
75 4 3.6
75 3 3.6
90 6 3.6
62 4 3.3
75 6 3.3
73 7 3.3
85 8 3.3
70 8 3.0
75 9 3.0
95 1 4.0
98 3 4.0
55 6 3.0