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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12 views

Correlations comparison between trialgroup and controlgroup using SPSS

I am new this community site and I need your help. The data below needs to find out how to get correlations pairs between trial group_store_NBR (store1 as 5) and control group_store_NBR. ...
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Table frequency [closed]

You have multiple options You need a frequency table with the percentage of only some options However all the variable name without any calculation should be displayed there
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What would be the most appropriate test to compare two groups in the three parts of the data?

I have a response dataset for twenty-five questions, which measures three grammar topics. The participants are two different English proficiency groups of intermediate and advanced. So, I want to ...
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How can I cluster plant biomass and grain weight for different plant varieties using Ward's method based clustering?

I have plant biomass and grain weight data for different plant varieties which I now need to cluster. Do I need to define the number of clusters if using Ward's method and Squared Euclidean distance ...
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Cross-validation for General linear model in SPSS

I am trying to predict the stress due to COVID using several predictors line age , race, gender, financial status.. We got data from a survey. Some of the predictors are categorical, some ordinal. ...
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Correcting for multiple comparisons in simple main effect analyses after signifcant 2-way interaction in SPSS

I ran a 2 x 2 x 8 repeated-measures ANOVA in SPSS and there is a significant interaction of factors A and B (both have two levels). To interpret this interaction, I ran simple main effect analyses ...
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How can I compare multiple response using different categories in same question?

I have a been asked a question regardining multiple responses and got stuck on what is best way to go about it. Here are 2 questions that the respondents where asked. Q1. Do you work in a private ...
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1answer
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Calculate p-value for one-sample T-test in SPSS: 1 - p/2?

In SPPS, for the p-value in a one-sample T-test, 1-tailed: When you find a mean that is in the opposite direction of your alternative hypothesis, do you have to do 1-p/2 or just p/2? Thank you!
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Does anyone know what test SPSS uses when performing a post-hoc tests for within-subjects effect?

I am conducting a one-way repeated measures ANOVA in SPSS version 27. Does anyone know the name of the statistical test that SPSS performs for post hos tests for within-subjects effect when the box &...
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Mediation analysis

What conclusions should be drawn if the indirect effect of variable X on Y(outcome) is significant via mediator variable M but the direct effect of X on Y is insignificant?
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Repeated measures ANOVA in SPSS, but within-subjects factor is defined using a nominal variable

I have 10 dependent variables corresponding to the performance of the same subjects in 5 trials. To distinguish between the trials, I use a nominal "Trial" variable for each entry that can ...
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How to correctly understand PROCESS model 4 for output “ Test of X by M interaction?

Perhaps some one can help me interpret some of the outputs of Hayes model 4. I designed a questionnaire that had good Cronbach and KMO scores etc. I did the PCA and have four components (factors). I ...
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Compare the mean of two independent samples (equal size)

I would like to check whether there are statistically significant difference between women and men in the use of the Internet. I have a data for 144 countries about the use of the Internet by women ...
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How to interpret output of quantile regression with interaction terms?

I'm running a quantile regression on SPSS to examine changes in the income structure over time in a certain profession, specifically trying to see if there is an increasing income inequality by ...
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What do you use for SStotal when calculating effect size η2 on SPSS for mixed-design ANOVA?

If you want to derive η2 values from a 2-or-more way ANOVA with at least one within-subjects factor, what items on the SPSS output do you add up to arrive at the total sum of squares (SStotal) for the ...
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22 views

How can I control for unobserved heterogeneity with cross-sectional data?

I want to run a cross sectional regression for 700 firms in the US to test the impact of working capital on profitability. I specifically want to limit my analysis to the 2008 financial crisis and ...
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Multicollinearity and case:predictor ratio problems

I have 444 cases and 60ish predictors that suffer from collinearity. The predictors fall into three categories (vol, thickness and demographics). I would prefer to subdivide my cases into 4 (age) ...
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Testing the Homogeneity of Slopes in Repeated measures ANOVA SPSS

I conducted a repeated measures ANOVA in SPSS, using the command Generalised Linear Model > Repeated Measures. I have a within subject factor with two levels (A), a measure (B) and a covariate (C). ...
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19 views

Multiple Imputation: Include Original Dataset?

I am using SPSS and I'm currently working with a datafile that contains multiple imputation (40 imputations) because of missing data. My question: Should I keep the original dataset (with missing ...
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1answer
23 views

How to analyze contingency table for multiple responses in SPSS or JASP?

I have two categorical (binary) variables: Gender (female vs. male) and 3 subject exams (English, Math, Science: Pass or fail). Everyone took all the subject exams (repeated measures). How can I ...
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1answer
20 views

Non-parametric alternative to two-way ANOVA using SPSS?

I would like to test for the interaction effect of 2 independent categorical variables on 1 dependent continuous variable using SPSS. Unfortunately, I do not have equal sample sizes; the residuals are ...
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1answer
31 views

How to perform moderator analysis in ordinal logistic regression?

How to perform moderator analysis in ordinal logistic regression using SPSS?
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1answer
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How to test linearity in ordinal logistic regression analysis?

One of the assumptions for performing ordinal regression is linearity. How to test this for this specific type of regression? Do you have to use logit etc.? And how does this work in SPSS?
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Viability of multivariable Cox regression results when one combination of variables has no events

I'm trying to figure out, if the results of a multivariable Cox regression analysis are viable when there are no outcome-events in one of the combination of categories of variables. Online, I could ...
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46 views

T-test for significant difference between two sets of percentages

I have been asked to compare two percentages of pass rates for a national exam using a t-test to see if there is a significant difference. The data is such: % pass for test takers in a program vs. % ...
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1answer
31 views

Would it be appropriate with a Chi-2 test in this case?

First of all, thank you for such a warm welcome to this forum. I am doing a study to see what diagnoses are the most common in a specific group (1) compared to another group (2). I want to show that ...
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1answer
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Running ANCOVA with categorical covariates - how to set up dataset?

I am analyzing a dataset in which 80 participants rated 4 products (product A, product B, product C, product D) from -3 to 3 depending on how much they liked the product. Each participant provided ...
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1answer
33 views

OLS, Logistic, or Poisson Regression for Data?

I'm a relative novice at statistics and would appreciate some help with a dataset I'm trying to crunch. I'm currently looking at factors that predict increasing utilization of healthcare resources ...
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1answer
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whether i can use independent sample t test or not for my sample? [closed]

Need some urgent help I am looking for gender difference on one variable Data is normal Sample size 83 Males - 67 Females - 16 Which test to run?
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1answer
115 views

SPSS: discrepancy between estimated marginal means plot and post-hoc tests?

I am using a mixed-Anova with one dependent variable measured across two time points (within-subject factor). There are two between-subject factors, between1 & between2, with items equally split ...
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1answer
43 views

How can I compare the variance or correlation between ranked *single answer* polls?

I am an undergrad psych major examining the differences in personal preferences between the extremist website 4chan and other websites, which will represent the pop norm. I would like to test whether ...
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1answer
78 views

Regression with multiple variables and time series (in SPSS)

I tried to find similar questions on this topic but couldn't find anything that helped me with my problem, so I will try to explain it on my own. I'm trying to do a regression analysis on revenue for ...
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1answer
17 views

Curve fit in SPSS repeated measures

I have cognitive data collected at 8 timepoints, which are 18 months apart. I would like to know what curve cognitive performance fits over time. I.e. is cognitive performance best explained by a ...
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1answer
38 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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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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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
30 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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1answer
39 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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22 views

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

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
31 views

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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1answer
29 views

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
44 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
54 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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1answer
74 views

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
18 views

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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9 views

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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1answer
29 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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1answer
78 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
78 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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