Recent content by shannahw

  1. shannahw

    Best book - Combination of statistics & SPSS?

    Hi all, I was wondering if you know a good book which can help in building up statistical knowledge in combination of working in SPSS? I am using Field, but I don't like the book that much. I think it is a little messy sometimes and when I want to do an analysis, I need to go back and forward...
  2. shannahw

    Critical n in order to reliably replace missing data with series mean?

    I am looking for a good source that I can use as argument to replace missing data reliably with the series mean. I have a dataset (n=118) from which three datapoints are missing. 2 datapoints are missing within Variable X and 1 datapoint is missing within Variable Y. 2 datapoints are missing...
  3. shannahw

    Mediation - Mediation and b path not significant, can I conclude that there is no relationship between the mediator and the dependent var?

    @hlsmith - Thank you, do know that, was maybe too little accurate in my description of my question :)
  4. shannahw

    Normally distributed errors assumption is violated (multiple regression)

    @hlsmith I did see Donnie Darko! And that's so interesting to hear. Learning more and more here :cool:
  5. shannahw

    Mediation - Mediation and b path not significant, can I conclude that there is no relationship between the mediator and the dependent var?

    Hi all, I have conducted a mediation analysis with Hayes PROCESS model 4. The overall mediation was not significant. Now, I am wondering the following: If the mediation and the b path within the mediation are not significant, can I conclude that there is no relationship between the mediator...
  6. shannahw

    Normally distributed errors assumption is violated (multiple regression)

    @hlsmith Thank you for your pragmatic outlook on the thing. Well... there's the ideal and there's... statistics... :D Your daughter the postmodernist :)
  7. shannahw

    Combining mediation and moderation in linear model (SPSS, PROCESS)

    @hlsmith Thank you for your input. I have never heard of the 'counterfactual model'. Suppose I would like to give this method a try in SPSS, where should I start you think in terms of literature, method? Also, with recanting witness, do you mean this can be a threat to validity?
  8. shannahw

    Normally distributed errors assumption is violated (multiple regression)

    @Karabiner Thank you for your elaborate answer. So, let me resume the main message: There is no method available to properly test the assumption of normality of residuals. This assumption only holds as a theoretical statement about the characteristics to which the population should adhere in...
  9. shannahw

    Normally distributed errors assumption is violated (multiple regression)

    Hi guys, I am testing the normally distributed errors assumptions for multiple regression with a visual inspection using a P-Plot plot. Now, I have the suspicion that the errors are not normally distributed (see image below). I have two questions about this: Is there any way to test this...
  10. shannahw

    Combining mediation and moderation in linear model (SPSS, PROCESS)

    I found an answer to my own question. It's called Moderated Mediation and can be performed with the PROCESS tool with Hayes Model 7. The covariates can also be included in this model. As for a tutorial about performing this type of analysis, I like this one: Moderated mediation in SPSS using...
  11. shannahw

    Combining mediation and moderation in linear model (SPSS, PROCESS)

    I want to perform a mediation analysis, but also include a moderator in the relation between the independent variable and the mediator (see conceptual model as attachment). I have been following the steps of Field to do a mediation in SPSS (Hayes PROCESS tool), but now I am stuck, because I am...
  12. shannahw

    Repeated-measures ANCOVA - Handle assumptions and missing data (SPSS)

    Thank you for your answer. I found several tutorials, but none seem, in my opinion, to be thorough and step-by-step. I was hoping to lean a little on the experience here and find the best one immediately ;). I have been missing it in Andy Fields book, which I like. I will share of course if I...
  13. shannahw

    Use OR conditional statement using the MISSING function (SPSS)

    Fantastic, thank you!
  14. shannahw

    Use OR conditional statement using the MISSING function (SPSS)

    I want to use an OR conditional statement using the MISSING function in SPSS (see below), but it doesn't work like this. Anyone knows how I can code this correctly? COMPUTE inclOndrzGeweig=1. IF (MISSING(geslacht | Leeftijd | RSES1_T0 | RSES2_T0 | RSES3_T0 | RSES4_T0 | RSES5_T0 | RSES6_T0 |...
  15. shannahw

    Repeated-measures ANCOVA - Handle assumptions and missing data (SPSS)

    Hi all, I am performing a repeated-measures ANCOVA in SPSS with following characteristics: Dependent variable: weight loss (with three points in time) Independent variable: conscientiousness Covariates: gender, age, depression I can't find a good online guide that will take me step by step...