Data List  Free / Con SL .

* Identify Constructs by first variable ("1", "2", etc.) and enter the SL as second variable ("0.8", "0.9", etc.).

Begin Data.
1	0.8
1	0.9
1 0.7
2 0.8
2 0.8
2 0.9
End Data.

Format Con (F1.0).

Compute SL2 = SL**2.

Compute E = 1-SL2.

ECHO 'Item Diagnostics'.

List Variables SL SL2 E.

AGGREGATE
  /OUTFILE=*
  /BREAK=Con
  /S_SL = SUM(SL) 
  /S_SL2 = SUM(SL2)
  /SE = SUM(E).


ECHO 'Pychometric Properties'.

Compute CR = (S_SL)**2 / (((S_SL)**2) + SE).

Compute AVE = S_SL2 / (S_SL2 + SE).

List Variables  CON CR AVE.