SPSS (Statistical Package for the Social Sciences) is a proprietary cross-platform general-purpose statistical software package.

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192 views

What to do when linearity is violated in a linear regression analysis SPSS

I am currently trying to undertake a linear regression analysis in SPSS and I have come across some difficulties. My data does not show linearity and therefore is violated. I have transformed both ...
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1answer
218 views

Rare event logistic regression

I have a situation in which that there are 4 cases with a condition per 1000 people surveyed (binary). I am interested in performing a logistic regression to determine the risk factors (binary). Is it ...
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141 views

Customizing a Split-Plot Model in SPSS

I am having a little trouble with SPSS in a rather complex design. I have to analyze an experiment with 1 within factor and 3 between factors. I don't want to test all possible effects (just the 4 ...
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3answers
116 views

SPSS three way dummy variables and descriptive statistics

I have two dummy variables, X1 and X2. Each one is coded into 0 or 1. Here is the breakdown: ...
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1answer
85 views

Weighted sample and logistic regression

I am doing logistic regression in which I have a weighted sample data. Should I should have the weight option on or off when doing logistic regression?
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1answer
51 views

How do I check for covariates and how do I adjust for them?

My data: My outcome variable (Outvar) is binary (yes/no) My explanatory variable (exvar) is also binary (yes/no) I have 3 extra variables: Variable A is binary Variable B is continuous but not ...
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1answer
140 views

Blocks and other questions about logistic regression with SPSS

I am trying to use logistic regression in SPSS. I am wondering, do I have to tell SPSS that, for example Gender, is a categorical variable? Also, I am planning to ...
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76 views

How do I weight population statistics in SPSS?

I'm struggling with analysing my survey results in SPSS and really hoping you can help. I surveyed occupational therapists around aspects of their practice, on a national level and the seniority of ...
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69 views

Stepwise regression and mediation analysis

In my research I have 3 domains of IV, 4 of MV and 8 of DV. To run mediation analysis I made possible chains from the results of stepwise regression and only one chain fulfilled the assumptions of ...
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1answer
364 views

Partial correlation plot, split by groups SPSS

Is it possible to illustrate partial correlation scatter plots for 2 subgroups on the same graph? e.g. I want to make scatter plots of data controlled for age, differentiated by males or females. ...
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2answers
768 views

SPSS from two - to one tailed test

If any of you would like to confirm if my understanding is correct or wrong, I will be most grateful. I have done an independent-samples t-test (two-tailed), for difference between women/men how they ...
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40 views

Advanced regression in SPSS

I have data of several school classes (with several pupils). I want to calculate expected/predicted values of class A for some items using a regression (a multiple linear regression in that special ...
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142 views

Advantage of using ANOVA over a kruskal wallis test

This question is a follow on from this question - Correlation with non-normal distribution. An ANOVA explanation was given here - Correlation between vegetation and erosion - that could be applicable ...
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107 views

Correlation with non-normal distribution

I want to find the correlation between a continous variable with a non normal distribution, positively skewed, and a categorical variable with 4 categories. The only test I can find that fits these ...
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1answer
120 views

Compare two independent variables

I have two variables, one containing project delivery rates for a particular language, and the second containing team size that worked on these projects. I am particularly new to statistics and I want ...
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174 views

Combining multiple imputation results for hierarchical regression in SPSS

I'm running a hierarchical regression model in SPSS. I used multiple imputation to handle missing data (14 imputations) and then ran the regression. The regression is: Step 1: 3 dummy coded ...
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1answer
159 views

Factor vs. Covariate in SPSS MIXED

I am using the MIXED command in SPSS to run a multilevel model and was wondering what the difference is when using a dummy coded factor either as factor (via the BY command) or as a covariate (via the ...
2
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1answer
217 views

Using AIC to select between models that use nested and non-nested variables

I'm using SPSS to try and find a mixed model that adequate explains the data that I have. Two of the explanatory variables are closely related ('Sample group' and 'individual'), as an individual is ...
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22 views

Computing several nominal varibles into two catgories?

I am using SPSS and am dealing with a multiple response question, Now I managed to compute each response into a variable. I have 14 variables in total out of the 14 responses, How can I compute them ...
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2answers
179 views

Correlation between vegetation and erosion

I am wanting to find the correlation between two variables: a categorical vegetation variable (with categories 1-4) and a continuous variable of erosion (with values anywhere between 0.2 and 9). I ...
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0answers
97 views

Evaluating clusters of variables produced by varclus & hclustvar

Background - I want to cluster analyze a mixed dataset, clustering the variables on the basis of correlational similarity. SPSS gives me this option, but doesn't allow me to evaluate the clustering ...
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30 views

How do I figure out how many points I need for their to be significance between 2 independent samples mean scores?

I have 2 products tested by totally separate samples. Product 101 was tested by 160 people and product 201 was tested by a different set of 120 people. People were asked how much they like the ...
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0answers
79 views

Mixed linear models with exactly the same AIC?

I have a dataset in which I measure the response variable of a number of individual animals. I used this response variable as the dependent variable in a linear mixed model, for which I have 5 ...
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169 views

How to find relationship between variables using SPSS?

A survey is done to study the prevalence of a parasite in a country, and a questionnaire is designed that has many questions measuring variables like family income, family size, and others. How can I ...
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199 views

Maximum likelihood factor analysis fails

When trying to use maximum likelihood Factor analysis instead of Principle component analysis in SPSS, what are the reasons that I am unable to complete a factor extraction using maximum likelihood. ...
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3answers
492 views

How to get pooled p-values on tests done in multiple imputed datasets?

Using Amelia in R, I obtained multiple imputed datasets. After that, I performed a repeated measures test in SPSS. Now, I want to pool test results. I know that I can use Rubin's rules (implemented ...
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2answers
144 views

Help translating the following PCA results into layman's terms?

As a non-maths doctoral candidate, I would be absolutely thrilled to bits if anyone here might be willing to take a stab at translating the following PCA results into layman's terms. There are only ...
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1answer
625 views

(Multiple) Correspondence Analysis for count data entered as binary variables

I have a data set, 1014 cases and 55 variables which are binary and is in the form of ...
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1answer
450 views

Random effects in mixed models

I am not very familiar with mixed models --- I have been reviewing the various tutorials on the web but still am not sure how to specify my model, even as a starting point for comparison. I have a ...
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26 views

How do we make a distinction between standardized and unstandardized coefficient? [duplicate]

In SPSS, regression analysis yields two types of coefficients (standardized and unstandardized). What is a standardized coefficient in statistical sense?
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67 views

Is it possible to plot factor scores in a graph?

I have 5 factor scores which were saved out from Mplus6 to SPSS using commands below. Savedata; SAVE=fscores; I have the variables in SPSS and used them in some ...
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65 views

If I compare conditions within two preexisting groups is that a quasi-experimental design?

I have two groups of participants, one group of psychosis patients and one group of controls. All of the participants complete a computer task that has three different conditions. So, I want to make ...
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108 views

more variables than cases in PCA/factor analysis

I'm trying to run a PCA on 15 variables for which I have a sample size of 10 (i.e. 15 columns x 10 rows, all continuous data). I have two problems: 1) more variables than cases and 2) some highly ...
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1answer
2k views

Correlation between scale and categorical variable

I am trying to find the correlation or association between a categorical variable - classes from 1 -4 from a GIS (geographic information system) classification - and a continuous variable with values ...
2
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3answers
154 views

How to know whether a set of Likert items form two scales using SPSS? How to assess the relationship between these two scales?

I have designed a questionnaire which has 16 Likert item questions; from 1 (strongly disagree) to 5 (strongly agree). The 16 Likert item questions are divided into 2 groups: 10 questions for customer ...
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0answers
154 views

need help with terminology and interpretation of two-way repeated measures ANOVA + sample size estimation

I want to estimate the sample size for my new study based on a pilot. My general concept of repeated measures ANOVA and my terminology is quite rusty which is confusing me (hence the ?s throughout the ...
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3answers
298 views

Can you do a paired t test in SPSS or GraphPad with only means, errors and N?

I have to verify some results. I have only the mean and its st. error, not the raw data. In a research paper they did a paired t test. Is it possible to check whether their p value is right by only ...
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106 views

Factor Analysis…Covariance Matrix help

I'm trying to run a factor analysis in SPSS on a set of social vulnerability data for my thesis. I have 5 communities, with 26 social vulnerability variables for each community. My overall aim is to ...
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74 views

In SPSS two factor ANOVA, how to compare control groups across other factors?

I have two factors: Brainregion (4 levels) and Group (5 levels). Glutamate is my dependent variable. I am running General Linear Models in SPSS (two factor ANOVA). Can I get the output in such a ...
3
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2answers
385 views

Is it possible to conduct a regression if all variables are ordinal?

I would like to produce a regression analysis model. I have ordinal categorical data. I can use SPSS. I do not know what analysis to perform or what assumptions to check. What are the statistical ...
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74 views

How to account for short-term trends of time-series data?

I would like to find out which of my 10 independent variables (IVs) best accounts for the changes of my dependent variable at different points of time within the last 30 years. In order to explain ...
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1answer
231 views

Binary logistic regression on SPSS 20 - output seems inconsistent and illogical

I have one categorical dichotomous dependent variable (yes/no - retention of newly learned words) and two independent variables - both are categorical. One independent variable is "delay between ...
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2answers
365 views

Unequal Sample Sizes for Two-way Repeated Measures

I have 3 different treatments with the observations of 6 different repetitions. However, all these different treatments (groups) have different numbers of patients. The first group has 26 patients, ...
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292 views

How do I check for normality prior to using a Mixed Anova?

I have just conducted an experiment in which I have measured glucose concentration in patients (4 different treatment groups) at 3 different weeks ( pre, 6 weeks and 12 weeks). I want to use Mixed ...
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0answers
88 views

In maximum likelihood, pattern matrix, one case $>1.0$

How bad is this for my model? I've used ML (maximum likelihood) with promax rotation and Kaiser on a dataset ($n>300$) to extract underlying factors to build a model. Eigenvalue selection was ...
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1answer
36 views

Compare mean effect of one predictor based on another predictor

I would like to compare the effect of one IV ("sensation seeking") on a DV ("intended infidelity") based on another IV ("gender"). Actually I really just want to compare the means. So I would like to ...
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3answers
265 views

How to cluster time series?

I have a question about cluster analysis. There are 3000 companies, which have to be clustered according to their power usage over 5 years. Each company has values for every hour during 5 years. I ...
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196 views

Cross-correlation significance in SPSS

How do I test the significance of cross-correlation values in SPSS? It seems there is no option for this.
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1answer
94 views

Why does SPSS create false means in my clustered bar chart?

I'm pulling my hair out on this one, so hope somebody can help me out. I'm using SPSS 19 on a dataset structured like this (dummy data): ...
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0answers
94 views

Methods for cross-sectional twin data (GEE, mixed effects modeling, GLMM)?

I have a twin dataset of 248 pairs (166 MZ, 82 DZ) that was gathered at one time point. I'm interested in looking at the relationship between a physiological biomarker and self-reported insomnia ...