Welcome to SPSS syntax.

...- SSB - SSAB). PRINT (SST - SSR - SSE). COMPUTE dfA = trace(part_A). COMPUTE dfB = trace(part_B). COMPUTE dfAB = trace(part_AB). PRINT dfA. PRINT dfB. PRINT dfAB. COMPUTE MSA = SSA/dfA. COMPUTE MSB = SSB/dfB. COMPUTE MSAB = SSAB/dfAB. PRINT MSA. PRINT MSB. PRINT MSAB. COMPUTE F_obs_A = MSA/MSE. COMPUTE F_obs_B = MSB/MSE. COMPUTE F_obs_AB = MSAB/...