* Factor analysis of Student sav.

FACTOR
  /VARIABLES maths1 maths2 maths3 maths4 maths5 maths6 maths7 maths8 maths9
  maths10 engl1 engl2 engl3 engl4 engl5 engl6 engl7 engl8 engl9 engl10 social1
  social2 social3 social4  /MISSING LISTWISE /ANALYSIS maths1 maths2 maths3
  maths4 maths5 maths6 maths7 maths8 maths9 maths10 engl1 engl2 engl3 engl4
  engl5 engl6 engl7 engl8 engl9 engl10 social1 social2 social3 social4
  /PRINT UNIVARIATE INITIAL CORRELATION KMO AIC EXTRACTION ROTATION
  /FORMAT SORT BLANK(.20)
  /PLOT ROTATION
  /CRITERIA MINEIGEN(1) ITERATE(25)
  /EXTRACTION PC
  /CRITERIA ITERATE(25)
  /ROTATION VARIMAX
  /METHOD=CORRELATION .

* Kaiser's criterion gives 5 factors, but on examination 4 or 3 factors would be more meaningful.

* 4 factors.
FACTOR
  /VARIABLES maths1 maths2 maths3 maths4 maths5 maths6 maths7 maths8 maths9
  maths10 engl1 engl2 engl3 engl4 engl5 engl6 engl7 engl8 engl9 engl10 social1
  social2 social3 social4  /MISSING LISTWISE /ANALYSIS maths1 maths2 maths3
  maths4 maths5 maths6 maths7 maths8 maths9 maths10 engl1 engl2 engl3 engl4
  engl5 engl6 engl7 engl8 engl9 engl10 social1 social2 social3 social4
  /PRINT ROTATION
  /FORMAT SORT BLANK(.20)
  /CRITERIA FACTORS(4) ITERATE(25)
  /EXTRACTION PC
  /CRITERIA ITERATE(25)
  /ROTATION VARIMAX
  /METHOD=CORRELATION .

* 3 factors.
FACTOR
  /VARIABLES maths1 maths2 maths3 maths4 maths5 maths6 maths7 maths8 maths9
  maths10 engl1 engl2 engl3 engl4 engl5 engl6 engl7 engl8 engl9 engl10 social1
  social2 social3 social4  /MISSING LISTWISE /ANALYSIS maths1 maths2 maths3
  maths4 maths5 maths6 maths7 maths8 maths9 maths10 engl1 engl2 engl3 engl4
  engl5 engl6 engl7 engl8 engl9 engl10 social1 social2 social3 social4
  /PRINT ROTATION
  /FORMAT SORT BLANK(.20)
  /CRITERIA FACTORS(3) ITERATE(25)
  /EXTRACTION PC
  /CRITERIA ITERATE(25)
  /ROTATION VARIMAX
  /METHOD=CORRELATION .

* maths3, engl3, and engl4 are still problematic items, therefore eliminate them.
FACTOR
  /VARIABLES maths1 maths2 maths4 maths5 maths6 maths7 maths8 maths9
  maths10 engl1 engl2 engl5 engl6 engl7 engl8 engl9 engl10 social1
  social2 social3 social4  /MISSING LISTWISE /ANALYSIS maths1 maths2 maths4 maths5 maths6 maths7 maths8 maths9 maths10 engl1 engl2
  engl5 engl6 engl7 engl8 engl9 engl10 social1 social2 social3 social4
  /PRINT ROTATION
  /FORMAT SORT BLANK(.20)
  /CRITERIA FACTORS(3) ITERATE(25)
  /EXTRACTION PC
  /CRITERIA ITERATE(25)
  /ROTATION VARIMAX
  /METHOD=CORRELATION .

* Results indicate a simple three factor structure, with Maths, English and Sociability.