Questions tagged [spss]

IBM SPSS Statistics is a statistical software package. Use this tag for any on-topic question that (a) involves SPSS either as a critical part of the question or expected answer and (b) is not just about how to use SPSS.

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30 views

How to deal with very large degrees of freedom? [closed]

I am using a dataset from an online database and the df seems to be huge. I do understand that higher degrees of freedom generally mean larger sample sizes. But can it be so big? If yes how can I ...
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21 views

AMOS Software Question: Where to find Changes in CFI, RMSEA, SRMR Indices? [MG-CFA Analysis] [closed]

I am new to AMOS and currently working on a project for questionnaire validation via model fit [MG-CFA Analysis] I am having issues with finding: $\Delta$CFI, $\Delta$RMSEA, $\Delta$SRMR Indices for ...
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1answer
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Why is x significant in linear regression but not in mixed model analysis?

I have a dataset ($n=700$) where I measured $x$ and $y$ (continuous) at three points in time ($T_0$, $T_1$, $T_2$). I am interested in running a mixed model analysis in SPSS. When I run normal linear ...
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18 views

How to generate probabilities from merging different datasets? [closed]

Let's say I have the following surveys, all national samples (for the U.S) - Survey 1 (sample results for california) 27% prefer apples for breakfast 94% of residents of SF prefer apples for ...
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7 views

How to add within-subject variable into moderation into PROCESS SPSS? [closed]

I am running a moderation with the following variables: x: multicategorical; 3 levels m: continuous y: continuous The within subjects is time, i.e., I am measuring ...
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SPSS and Scipy deliver different ANOVA results [closed]

My dataset is in that form: group | score 1, 5.3 1, 7.8 2, 3.2 3, 8 ... I want to know, if there is any correlation between score's value and ...
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26 views

Moderated mediation has different results if run on R (rosetta) or on SPSS (PROCESS)?

I run the same moderated mediation in spss and in R. In R I run ...
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1answer
18 views

multicollinearity and interaction

I am a bit confused between multicollinearity and interaction. Would anyone mind explaining it to me and the difference between the two and how they affect the variables? I understand that ...
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21 views

Why do results differ with and without offset in Poisson regression?

I have a dataset with counts of preterm births for five years by county. I am running analyses to see whether contaminant water concentration levels for each county for each year predict preterm ...
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11 views

Mediation: Significant positive a and b paths but insignificant negative c and c' paths

Hi I used PROCESS on SPSS to run a mediation analysis using 1 IV, 1 mediator and 1 DV. a and b paths were found to be positive and significant. However, both c and c' paths were negative and not ...
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1answer
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Comparison / Selection of covariance structures - linear mixed model in SPSS

Hi together, I am currently trying to build a linear mixed model with repeated measurements in SPSS. I would expect that the correlation between my measurements is highest at adjacent time points, so ...
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14 views

When running a multivariate linear regression analysis, are both dependent and independent variables scanned for outliers?

I want to run a multiple regression analysis using SPSS. I have used the Mahalanobis d square method to find outliers, however my question is, do I add the dependent variable to the list of ...
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1answer
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Analysing SPSS two-way ANOVA output: Tests of Within-Subjects Contrasts

I used SPSS to run a two-way within subjects ANOVA (IV1 and IV2). The IV1 * IV2 interaction was not significant but main effects of both IV1 and IV2 were. I would like to know if the trends followed a ...
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1answer
29 views

Multiple regression with dummy variables: identical VIF, Tolerance and Standard Error

Im fairly new to stats and regression but trying to learn and I've come across something that doesn't seem right to me. I have used dummy variables to run a multiple regression model to predict the ...
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1answer
8 views

Interpreting Non-Significant Moderated Regression for Multiple Interactions and a Surprisingly Significant Main Effect

I was wondering if someone could explain this to me. I've carried out a hierarchical regression, entering 9 independent variables at Step 1 (Block 1), and 8 interaction terms at Step 2 (Block 2). The ...
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1answer
2k views

After bootstrapping regression analysis, all p-values are multiple of 0.001996

I'm running various multiple regression analyses in SPSS 27, and with those that are not bootstrapped, the p-values vary such that I do not find the same p-value twice within a regression (e.g., the p-...
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Box's M fewer than two nonsingular cell covariance matrices

would appreciate some help with the following problem. While running a MANCOVA i received the following error message from SPSS: " Box's Test of quality of Covariance Matrices is not computed ...
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1answer
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When running a reliability analysis (using Cronbach's alpha) in SPSS, what does “scale” refer to? Do I have to compute a scale explicitly beforehand?

Is the scale meant to represent the sum of responses (each response is an element of, say, the set {1, 2, 3, 4, 5}) of a case (an individual) to a set of questions (items)? And is a "scale mean&...
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1) Testing for homogeneity within a group and 2) testing if factors affect outcome

I am a research intern at a plant breeding company and do not have much SPSS experience and would like some advice considering this question/research. The added image visualizes steps 1 to 4; see ...
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20 views

How to perform post-hoc with logistic regression in SPSS? (Two dichotomous IVs)

I performed a logistic regression in SPSS using two IVs (both dichotomous) and found a significant interaction effect. Now I want to understand where the differences come from. ⠀⠀⠀⠀⠀⠀ V1_a⠀⠀⠀⠀V1_b ...
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How can I measure the relationship between an independent nominal variable and a dependent ordinal variable?

I have one independent variable that is nominal and a dependent one that is ordinal. I want to study the relationship between these two variables and conclude if there is a relation of dependence. ...
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35 views

SPSS K-means Clustering: “Not enough cases to perform cluster analysis”

As you can read in the title I get the error message "Not enough cases to perform cluster analysis" after trying K-Means Clustering including all the variables (or columns). I will try to ...
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1answer
32 views

Why am I getting p=1 in Fisher's exact test?

I have 8 IV and 1 DV, they are all dichotomous and categorical data, so I am using Cross-tabulation Chi-square test. So 8 tests conducted. All test have at least one expected count less than 5. So I ...
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1answer
24 views

Based on the output, what is computed value for r?

(What is the value exactly as it appears on the output with no spaces between characters.)? Pearson's correlation coefficient is r.
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1answer
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Which statistical model/test to use for understanding change in housing location?

I have data on 1000 households. I have: Their present housing location and their previous house's location before they moved to this house (Latitude, Longitude) Count of urban amenities (spread ...
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18 views

SPSS GEE: which type of model to select?

I would like to conduct a GEE analysis (repeated measures logistic regression) but I am not sure whether my data allows me to run a GEE Binary Logistic Model or if I should use GEE Binomial Identity ...
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1answer
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what type of analyses to use if one of the dependent variables is omitted when another dependent variable takes a certain value?

I have one independent variable (IV) and two dependent variables (DV1 and DV2). DV1 can take value 0 or 1. DV2 can take a value between 1 and 7 only if DV1 is 1. If DV1 is 0, then DV2 is omitted. As ...
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1answer
49 views

How to decide if categorical variable is significant in cox regression, SPSS

I performed univariate analysis to identify predictors of survival in a cohort. In a second step I performed multiple cox regression of the factors significant in univariate analysis. One variable is ...
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1answer
36 views

Shouldn't the adjusted p value be less than the normal p value?

I am following an SPSS tutorial for Kruskall-wallis test. In the example give, we are comparing the driving reaction time for 3 groups (each group contain 10 subjects) following a drink. 1st grp was ...
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1answer
88 views

How should I interpret the median and the interquartile range?

I have a 7 point Liker Scale, ranging from 1=Strongly disagree to 7=Strongly Agree that has the purpose to measure if the respondents recognize the logo of a brand. I estimated the median and the ...
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1answer
12 views

How to select last year of inclusion within repeated measures of each patient?

I have an SPSS file with each patient being recorded multiple times (1-8 times per patient). Each record is a different row in SPSS (I have over 4000 records). Now, I would like to select the latest ...
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1answer
26 views

Loop over a variable prefix in SPSS for regression [closed]

I want to loop over a variable index to generate a regression model for each predictor. This is not possible with either loop or do repeat. I have a set of predictors like var1_indep, var2_indep, ...
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1answer
36 views

Redundant Parameters in Cross-Level Interaction: Mixed Modeling

I'm using SPSS to run a Mixed Model with two categorical (factor) predictors with an interaction between the two predictors. I get the following Estimates of Fixed Effects: In the interaction I am ...
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1answer
29 views

Mediation even though index of moderated mediation is not significant?

I ran Hayes process macro in spss. In my results below, you'll see that indirect effects are significant on both levels of my Independent Varaible (IVAlgo), however the index of moderated mediation is ...
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1answer
603 views

What is mean rank?

I am a student and I am doing a project that consists of calculating Mann Whitney U test. I would like to know the definition of mean rank that is calculated with this analysis. Also, I would like to ...
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1answer
14 views

Can I see Log-likelihood values for two-step clustering in SPSS?

I need to compare Two-step clustering with latent class analysis. As LCA is not possible in SPSS I did it in R, however, 2-step clustering in R is quite challenging, so I did it in SPSS. To compare it ...
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1answer
18 views

Presenting crosstabs in addition to multinominal logistic regression results (SPSS)

I'm using multinominal logistic regression (MLR) in SPSS to build a predictive model to identify which variables have an independent effect on an outcome, all things being equal. I then want to use ...
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1answer
23 views

SPSS - Automatic Linear Modeling “Importance” Numbers

I have a large set of survey data. I'm looking at trying to find out which variables are the most important to impacting a DV (call it "happiness"). I'm not looking to find a beta number ...
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1answer
40 views

Interpret coefficient of negative binomial regression

Am I understanding this right? I have run a negative binomial regression on overdispersed count data (Y is number of litter items found, and X is the distance to the shoreline), in SPSS. The omnibus ...
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1answer
21 views

Should I reword the Factor if it shows all negative loadings?

I've seen very similar questions but none really address my issue. I ran a PCA on 29 items to identify different factors of stress and worry. All items were on a scale from 1 to 3 and none of these ...
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2answers
30 views

What analysis do I do? (Wage, education, gender)

I'm doing research on pay in function of degree (master vs. doctorate) and gender (man vs. woman). My research consists of 1 dependent variable: salary (salary varies from 210 euro to 12.000 euro in ...
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0answers
6 views

What test to use on distance data inside SPSS?

I have a set of GPS points that I have put inside a GIS software to obtain their distance from the Florida coast. These points represent litter found on the ground. So for each point, I have data as ...
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0answers
29 views

Comparing counts between groups with replicates

I hope you can help me. I need to compare count data (number of grazed plants among plants previously marked inside a plot) recorded in 4 different sites (replicates), each of them receiving 2 ...
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1answer
18 views

Count data - Poisson or negative binomial - SPSS?

I have count data of litter found across a beach. In one column there is the litter type (plastic bottles, glass bottles etc.) and in the other the quantities found, such as below: You can see that ...
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0answers
7 views

How does one interpret results from an ordinal regression analysis in SPSS?

Let's say I perform an ordinal regression analysis and I use 15 predictor variables of which 5 have turned out to be significant but each predictor has different levels as I have used ordinal ...
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1answer
67 views

Correlation between scale and ordinal variables?

I am currently writing my thesis, and one of my research questions involves testing a correlation between two variables from my questionnaire. One of the variables is a number between 1.0 and 5.0, ...
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1answer
68 views

Interpretation of Kruskal Wallis post-hoc pairwise comparisons - SPSS

I've run a KW test on my set on non-parametric data in SPSS, the output of the test giving me a p-value <0.05. As I have 20+ groups in my data set, I'm interested to see which group significantly ...
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0answers
33 views

Creating a 2-level mixed model in SPSS to find predictors nested within subjects

I'm working with longitudinal data, and am using the mixed models function ins SPSS to look for predictors (level-1) nested within individuals (level-2). If I add the participant ID as "subject&...
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1answer
36 views

Uneven count data - which road to take? SPSS

Stats novice- I'm wondering which road to take when it comes to uneven count data. My data consist of quantities for 22 plastic debris types (bottles, caps, lids, bags...) found on a beach. As they ...
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0answers
15 views

How to check for outliers and leverage values in SPSS when conducting a multinomial logistic regression?

I am conducting a multinomial logistic regression in SPSS. I want to check for the presence of outliers and high leverage values. How do I do that in SPSS?

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