Well, you can just run the equation, but ask for collinearity statistics and residual plots too.

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Original Message:

Sent: 11/20/2023 1:17:00 PM

From: belulu Stud

Subject: RE: Comparing Variables Measured on Different Scales for Multiple Regression Analysis in SPSS

Thank you for your replies Jon!

Dependant variable (ambivalent sxsm, AS S) = metric, continuous

Independent variable 1 (Honesty-Humility, HEXACO) = metric, continuous

Independent variable 2 (narcissism, NPI-15) = forced-choice format with dichotomous answers to each item (Now for the NPI, you normally simply calculate the grand sum for evaluation, since every item can give 1 or 0 points, depending on the choice, the max. would be 15)

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belulu Stud

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Original Message:

Sent: Mon November 20, 2023 01:02 PM

From: Jon Peck

Subject: Comparing Variables Measured on Different Scales for Multiple Regression Analysis in SPSS

If you are going to run a linear regression, what would the dependent variable be? Are there other variables that you are supposed to include in the equation?

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Original Message:

Sent: 11/20/2023 12:57:00 PM

From: belulu Stud

Subject: RE: Comparing Variables Measured on Different Scales for Multiple Regression Analysis in SPSS

I measured three variables in an online questionnaire. One with the Likert scale, one with a modified Likert scale with 6 levels and one, the NPI-15 as a forced-choice format with dichotomous answers to each item. I don't quite understand the second question

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belulu Stud

Original Message:

Sent: Mon November 20, 2023 12:32 PM

From: Jon Peck

Subject: Comparing Variables Measured on Different Scales for Multiple Regression Analysis in SPSS

I don't see why you would need multiple regression here. I'd suggest looking at nonparametric correlation coefficients - Kendall's tau-b or Spearman. (Analyze > Correlate > Bivariation)

You might want to go further and look at heterogeneous correlations (Analyze > Correlate > Heterogenous Correlation). For this, you need to be sure that the measurement levels are set correctly via the Data Editor Variable View.

You would also need to install the SPSSINC HETCOR extension command via Extensions > Extension Hub. If you have Statistics V29, you can then just run that, but if your version is older, there is some complicated setup that probably isn't worth the trouble here.

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Original Message:

Sent: 11/20/2023 11:37:00 AM

From: belulu Stud

Subject: Comparing Variables Measured on Different Scales for Multiple Regression Analysis in SPSS

Hi everyone, If anybody could give some advice you'd be my life saver. I measured three variables in an online questionnaire. One with the Likert scale, one with a modified Likert scale with 6 levels and one, the NPI-15 as a forced-choice format with dichotomous answers to each item. I wanted to analyze the relationship between the variables using a multiple regression analysis in SPSS. Now for the NPI, you normally simply calculate the grand sum for evaluation, since every item can give 1 or 0 points, depending on the choice, the max. would be 15. Is it even possible to compare two variables that have been measured using a Likert scale (the variable gets calculated using the MEAN function in SPSS) to one with a forced-choice-format (the variable gets calculated using the SUM function in SPSS)? Or could I just calculated the mean for the NPI-15 anyway despite of the format used in collecting the data? Or will this mess up my data? This is my first time working with SPSS, please be kind if my question is super dumb.

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belulu Stud

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