SET SEED  32476589.
*You put in your own 8 digit number--then comment out the above line for subsequent runs.

new file.
input program.
*Draw 120 cases, with 20 cases at each of 6 times.
	loop #1 = 1 to 120.
		*We'll first decide what time the case goes in.
		*This is very inelegant, cuz I don't have my manuals in my office.

		if #1 le 120 Time = 5.
		if #1 le 100 Time = 4.
		if #1 le 80 Time = 3.
		if #1 le 60 Time = 2.
		if #1 le 40 Time = 1.
		if #1 le 20 Time = 0.
		*Now we will generate a tentative PTSD score for each person.
		compute dv = rv.normal(0,1).
	end case.
	end loop.
end file.
end input program.
save outfile = "calvin:lab2dat.sps" /keep time dv.
*Replace the word "calvin," which is the name of my hard drive, with the name of your hard drive.

*Now we have our basic data. 

*Now modify the data to build in a trend.
	If time = 0 dv = dv*3.95 + 5.19.
	If time = 1 dv = dv*4.28 + 7.96.
	If time = 2 dv = dv*3.25 + 9.15.
	If time = 3 dv = dv*3.87 + 8.90.
	If time = 4 dv = dv*4.10 + 6.80.
	If time = 5 dv = dv*3.63 + 5.25.
	
save outfile = "calvin:lab2dat.sps" /keep Time dv.	

ONEWAY 
 dv BY time(0 5)  
 /POLYNOMIAL= 2 
 /HARMONIC NONE 
 /STATISTICS DESCRIPTIVES 
 /FORMAT NOLABELS 
 /MISSING ANALYSIS .