*TERR.
COMPUTE AME_G = MEAN(
TERR2_7,
TERR2_8) .
EXECUTE .

COMPUTE ARA_G = MEAN(
TERR2_5,
TERR2_6) .
EXECUTE .

COMPUTE ISR_G = MEAN(
TERR2_3,
TERR2_4) .
EXECUTE .

COMPUTE PAL_G = MEAN(
TERR2_1,
TERR2_2) .
EXECUTE .

COMPUTE AME_T = MEAN(
TERR1_7,
TERR1_8) .
EXECUTE .

COMPUTE ARA_T = MEAN(
TERR1_5,
TERR1_6) .
EXECUTE .

COMPUTE ISR_T = MEAN(
TERR1_3,
TERR1_4) .
EXECUTE .

COMPUTE PAL_T = MEAN(
TERR1_1,
TERR1_2) .
EXECUTE .

*ETN.
RELIABILITY
  /VARIABLES=ETN_1, ETN_2, ETN_3,
ETN_4, ETN_5, ETN_6
  /SCALE('ALL VARIABLES') ALL
  /MODEL=ALPHA
  /STATISTICS=CORR
  /SUMMARY=TOTAL.

COMPUTE ETN=mean(ETN_1, ETN_2, ETN_3,
ETN_4, ETN_5, ETN_6).
EXECUTE.