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

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Compairing 2 ideas - multiple dependent variables

I am trying to compare 2 ideas to see which one is better/more effective - I am looking to see if a significant difference. (2 conditions) We used a questionnaire to gather feedback from hundreds of ...
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2answers
89 views

factor analysis problem in structural equation model

I am using an Extended Technology Acceptance Model and have adopted an instrument from a research paper. After performing factor analysis in SPSS, most questions related to different constructs ...
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156 views

Ordinal Independent Variables and Dependent Variable Regression Analysis

I have 3 variables (2 are independent and 1 is dependent). All three variables are measured with questionnaires consisting of multiple questions recorded on 5 point scale. I want to perform regression ...
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87 views

Detecting outliers in non parametric data

what is the best (and easy) way to detect outliers in spss for skewed, not exactly normally distributed data? Thanks a lot
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1answer
95 views

SPSS outcome interpretation

I am very new with statistical programms, statistical analysis and SPSS. Now I even have to use the GEE function which seems to be a little too much for me. Do you ...
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79 views

Logistic regression control variables vs. layer in crosstabs

I would like to know how SPSS controls for variables in logistic regression in order to report the correct "controlled" OR. The specific case which bothers my is as follows: Let's say I have one IV ...
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3answers
61 views

Analysing the correlation of two ranked scales

So I am researching if self-esteem has an effect on hearing aid satisfaction in patients. The patients have filled out two questionnaires, the first measuring self esteem, the second measuring their ...
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100 views

Mixed model, repeated measures, nested?, nominal data

I am not sure how to approach the statistical analysis of the following study. Any insights would be greatly appreciated. Thanks! So, I have two independent groups, group A and group B. I am ...
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92 views

How does my questionnaire analysis plan sound?

I will soon have the results of a questionnaire that I have carried out, and I have made a plan on how I will analyse the data. I was hoping that someone could comment on my plan to advise me. About ...
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100 views

spss principal axis factoring output problem

I am trying to run a factor analysis (SPSS) using principal axis factoring with an oblique (or promax) rotation because the variables are highly correlated. However, the output for "total variance ...
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2answers
27 views

Linear correlation in ANCOVA - necessary?

I've been told by my stats prof that running an ANCOVA relies on a series of assumptions, including that the the dependent variable and the covariate are linearly related. So, in SPSS the first thing ...
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1answer
144 views

use spss to analyse a cluster randomized data

I have data from a cluster randomized trial, that is, each subject in the same cluster has received the same treatment. Do chi square test and t-test need some adjustments? More precisely, which ...
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29 views

Empty significance in SPSS linear regression

I got a weird result with linear regression: there are empty significances. I use 'Stepwise' method, so it should drop the inadequate variables. (Of course the "000" Betas are confusing too.) What ...
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41 views

How to test for mediation with a continuous mediator and DV, but a categorical predictor?

I want to explore whether attitudes mediate the relationship between employment status and intention to apply to graduate school. (See image below). I planned to use the Sobel Test to explore the ...
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1answer
24 views

Reading a crosstabs

I am confused and struggling to read this simple crosstabs. I am trying to create a profile of downloaders. One of the demographics I am looking at is age. Should I be looking at the percentage ...
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1answer
177 views

Building a time series model using more than independent variables

I am working on a project, and I am totally new to statistics. I have sales data for last two years at week level, along with other variables like temperature, holiday (TRUE/FALSE), where holiday are ...
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3answers
639 views

How can I improve the predictive power of this logistic regression model?

I am using SPSS to analyze a data set which aims to predict whether individuals have cancer based on five symptoms (a, b, c, d, e). In this data set most individuals have cancer. I ran a Binary ...
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1answer
67 views

SPSS linear regression - variables that are percentages

I have some data about music styles played at festivals. It looks like this: Based on this (and other) data, I'd like to make a model to explain the price of a ticket for each festival. However I'm ...
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100 views

How to do Simulation for Time Series Model using SPSS

I am totally new to SPSS. I have a question on Simulation. Can we apply simulation for time series model using SPSS? Thanks in advance.
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5answers
514 views

Unequal variances t-test or U Mann-Whitney test?

I have two independent samples and I need to compare their values, to say if values in the first group are higher than values in the second group. I performed the Levene's test and the variances are ...
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41 views

How to apply GEE and how to use it for critical mass

sorry I am completly new to the forum and as well to using GEE and SPSS so I hope my question is not to confusing. My dependent variable is the firm performance and I have several controlling ...
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2answers
136 views

should i take this variable which consist only 1 question in factor analysis? (all other variables are based on multiple questions)

I'm conducting a study on internet shopping adoption. I'm using a structural model from a research paper. My supervisor has asked me to conduct a factor analysis using SPSS. I'm quite weak in stats ...
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1answer
242 views

ANCOVA: ordinal covariate on SPSS

I'm trying to run an ANCOVA on SPSS with 3 variables: Gender, score 1, score 2. I want to control for the possibility that gender has an effect the scores, in order to isolate just the relationship ...
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1answer
100 views

Can I use the chi-squared test of independence with skewed data?

I have two variables, both categorical, one with skewed responses. How do you deal with skewed data in the chi-squared test? Are there any other relevant tests? I want to perform the test in SPSS.
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17 views

Comparing groups using SPSS

I have a dataset with 2 measures that were tested over 30 time points. I have a two groups of people who have both measures at all 30 time points. How do I compare the groups using SPSS?
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1answer
186 views

Bootstrapped t test in SPSS: Why are some p value cells blank?

Using an independent samples t test, I am comparing the performance of 2 groups on an activity, based on the percentage of items correct (the percentage of total items correct, as well as percentage ...
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1answer
118 views

ISPSS: Cross-sectional time series analysis

I am trying to run a multiple regression in SPSS. I am using panel data with 4 independent variables. Of these, one is a dummy variable. Can someone please guide me through the process or give me ...
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1answer
25 views

How to paste SPSS output using the LIST command into SPSS - the output all pastes into one cell [closed]

If I use select if and then list some variables, the output appears as a plain text table in the output viewer. When I paste this into Excel it all goes into one cell. I've tried the copy special ...
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1answer
194 views

How do I “nest” data in a mixed-effects model? and MANY related questions about mixed effects models!

I treated 80 people with drug X and 80 with drug Y. I presented the drugs to them in groups of 10 (meow groups). The drug was consumed for 15 weeks. They reported the severity of their headaches (from ...
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1answer
44 views

45th and 55th percentile

I have a series of data from a household budget survey and want to do the following in SPSS: Identify the food expenditure shares of total household expenditure that are at the 45th and 55th ...
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1answer
108 views

How do I convert unstandardized RMR estimates into standardized RMR estimates?

I am having difficulty turning unstandardized RMR estimates from AMOS software output in a SEM into standardized estimates to enable suitable interpretation. Can someone give me advice on where to ...
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1answer
335 views

Using Univariate ANOVA with non-normally distributed data

If my data are non-normally distributed and I'm conducting a 2x2 ANOVA, what can I do to correct for this problem so I can report the main effect and interaction output appropriately? Only one ...
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126 views

repeated measures ANOVA with covariate

I conducted a repeated measures ANOVA and added a continuous covariate. Now there is a significant main effect of that continuous covariate. If I report that main effect I need to say something about ...
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1answer
178 views

Statistical significance for comparison of linear regression models

I have two linear regression models (with the same predictors) that try to estimate two different (although related) features of the same population. I am analyzing the hypothesis that these ...
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96 views

Fisher's Exact: why no test statistic for 2x2 tables in SPSS

Whenever I have used the Fisher's Exact test on tables larger than 2x2 contingency tables, SPSS has produced a test statistic that I can quote in my work. However, when I do the same with 2x2 tables, ...
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1answer
109 views

How to compare pre- and post-tests when subject identifier is missing?

My colleague and I are professors and we conducted an experiment in which we would please like some advice on deciding which tests to use in SPSS. He taught 4 classes of students on 2 different ...
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45 views

Linear Mixed Models with variable time points in SPSS

I am analyzing a clinical study measuring patients' symptoms and brain structure sizes over three time points. The "visits" should be at baseline, 3 months and 12 months but they vary considerably and ...
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1answer
98 views

Statistically prove the effectiveness of a treatment using GLM repeated measurements

I have two lots of samples: one is the control lot and the other undergoes some treatment. I did three measurements for the samples: one at the initial time (T1) ...
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1answer
180 views

Constant forecasts in SPSS

I have weekly data for the last four years. I am using SPSS to do forecasting. I am getting a constant value in the forecast period. What could be the reason behind it? Is it due to defining weekly ...
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1answer
263 views

Can i do a paired t-test on a pre- and post questionnaire but without pairing the same student for the pre and post?

I really suck at this so hope you could help me ve a group of people attending a training course, in order to measure whether the training course is effective in improving attendees' knowledge. We ...
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1answer
400 views

How to combine several categorical variables into one quality of health measure?

I am new to SPSS, and am trying to use SPSS to generate a variable on the quality of health service available to the residents of an area. Below are the categorical variables that could tell me the ...
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1answer
120 views

Save R MICE Imputed Data as SPSS data

I am calling the R MICE routines into SPSS to do multiple imputations. My question is how to save the multiple imputed data sets as SPSS files for later analyses. Any help would be greatly ...
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151 views

Which graphs are best suited to visualize multiple pre- and post-test scores between multiple groups?

I have a relatively small sample ($N = 64$) with the following variables: ScoreA_I: continuous pre-test response variable ...
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1answer
115 views

Confidence interval does not include 0, but Wilcoxon test is sgnificant

I've created an error plot with CI 95% to visualize the difference (post test - pre test) between achieved scores. n = 64 Judging from the confidence intervals one could conclude that there's is ...
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1answer
36 views

Does power of a test depend on number of cases or number of observations?

Cases and observations. It is my understanding that sample size is determined by the number of individuals taking part in an experiment (from my undergrad Psychology stats course). For each ...
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0answers
97 views

How to code and analyze skiped questions with SPSS

sorry if my question may seem rather silly, but I'm not well up on statistics and need a piece of advice. I have some cases in my dataset where respondents have abandoned the survey half-way, so I ...
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69 views

random effect in mixed linear model SPSS

I am using a mixed linear model to analyze the effect of two types of treatment on symptoms. The two treatments were administered in smaller groups (clusters), and delivered by several doctors, so I ...
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0answers
26 views

How can I statistically compare two time-series? [duplicate]

I have two time-series. Data have been logged over time for two different objects. Is there a significance test, applicable in SPSS or Minitab, that can be used to determine whether there is a ...
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3answers
435 views

Correlation and group difference with unequal sample sizes

My sample is 60 participants. At first, I did not expect to analyze the correlation, but the result is interesting, so I would like to. The 60 participants are 50 people who have good reading skill ...
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18 views

Should I include multiple mediating variables in the same analysis?

If the answer is "it depends", what does it depend on? I have three mediating variables, one predictor variable and one outcome variable. I have observed that the results I get when I run three ...