* Reliability analysis of student sav.

* Maths (Francis demo).

RELIABILITY
  /VARIABLES=maths1 maths2 maths3 maths4 maths5 maths6 maths7 maths9 maths8
  maths10
  /SCALE('ALL VARIABLES')  ALL/MODEL=ALPHA
  /SUMMARY=TOTAL .

* Remove maths3.

RELIABILITY
  /VARIABLES=maths1 maths2 maths4 maths5 maths6 maths7 maths9 maths8
  maths10
  /SCALE('ALL VARIABLES')  ALL/MODEL=ALPHA
  /SUMMARY=TOTAL .

* English (Francis exercise 6.1).

RELIABILITY
  /VARIABLES=engl1 engl2 engl3 engl4 engl5 engl6 engl7 engl8 engl9 engl10
  /SCALE('ALL VARIABLES')  ALL/MODEL=ALPHA
  /SUMMARY=TOTAL .

* Remove engl3 engl4.

RELIABILITY
  /VARIABLES=engl1 engl2 engl5 engl6 engl7 engl8 engl9 engl10
  /SCALE('ALL VARIABLES')  ALL/MODEL=ALPHA
  /SUMMARY=TOTAL .