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Please note that version SiSSy1.12 contained a serious error. I am very, very sorry for that.
The simple slope that the syntax generated for MODERATOR = -1 (for dichotomous moderators) or MODERATOR = -1SD (for continuous variables) was the same as the slope for MODERATOR = +1/+1SD.
Also, the syntax was missing periods at the end of two commands.
Both of these errors are corrected (hat tip to Sandra S. and Jan C. who noticed these mistakes first!). So, if you have run analyses using SiSSy1.12 (between August 11 and August 30, 2011) please rerun them using SiSSy 1.12.2.

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SiSSy 1.12.2 [20111013]
Simple Slope Syntax for Test of Moderation and Simple Slopes for One Dichotomous or Continuous Moderator Candidate of One Centered IV in SPSS

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in order to download this tool for offline use, click here
fields and buttons can be accessed with [alt]+x where x is the number of the step or the characters in brackets next to choices.
syntax output will be updated automatically (if existent) after changes to «i. SPSS version», «ii. dichotomous or continuous moderator candidate?», «iii. moderator standardized?», & «iv. long or short syntax version».
  1. SPSS version
    2. <12 [a]  ≥12 [b]

  2. dichotomous or continuous moderator candidate?
    3. dich[x] cont[y]

  3. is the moderator candidate variable standardized?
    [if you mark 'no', this means that your moderator is only centered and you have to indicate its sd below. if you mark 'yes', an sd of 1 will be assumed.]
     
    4. no [c] yes [d]

  4. Syntax version
    5. long [l] short [s]
  1. Enter the SPSS variable name of the centered independent variable:
  2. Enter the SPSS variable name of the moderator candidate variable:
  3. Enter the standard deviation of the continous moderator:

  4. Enter the SPSS variable name of the dependent variable:



Based on the Jena IGC Seminar on Methods of Intergroup Research and Aiken, L. S., & West, S. G. (1991). Multiple regression: Testing and interpreting interactions. Thousand Oaks: Sage.

written by Thomas Schubert and Johann Jacoby [2004]. please report bugs and suggestions to them. direct link:

SiSSy has been used in the following works:

Judge, T. A., & Hurst, C. (2007). Capitalizing on one's advantages: Role of core self-evaluations. Journal of Applied Psychology, 92, 1212-1227. doi:10.1037/0021-9010.92.5.1212

Dearing, E., & Hamilton, L.C. (2006). V. Contemporary advances and classic advice for analyzing mediating and moderating variables. Monographs for the Society for Research in Child Development, 71(3), 88-104. doi:10.1111/j.1540-5834.2006.00406.x

Pugh, S. D., Groth, M., & Hennig-Thurau, T. (2011). Willing and able to fake emotions: A closer examination of the link between emotional dissonance and employee well-being. Journal of Applied Psychology, 96, 377-390. doi:10.1037/a0021395

Sher-Censor, E., & Oppenheim, D. (2010). Adjustment of female adolescents leaving home for the military: Links with earlier individuation. Journal of Adolescence, 33(5), 625-632. doi:10.1016/j.adolescence.2009.12.001

Sher-Censor, E., Parke, R. D., & Coltrane, S. (in press). Parents' Promotion of Psychological Autonomy, Psychological Control, and Mexican-American Adolescents' Adjustment. Journal of Youth and Adolescence, 40(5), 620-632. doi:10.1007/s10964-010-9552-3

J Youth Adolesc. 2011 May; 40(5): 620–632.