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

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48 views

Repeated Measures ANOVA or mixed model? And with massive group differences?

I need some guidance on which statistical test to use: I want to know if the nature of frog calls changes depending on the time of day. I observed 4 species of frogs at the same 3 times for several ...
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53 views

What's a good Nagelkerke value?

My model has Nagelkerke $R^2 = 0.282$ as outputted by SPSS. Having read some literature, it claims that this should be counted as a good value. However, since the maximum value is 1, this means that ...
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48 views

Comparing the difference in change in repeated measures ordinal variables between two groups

I have two groups of patients, those with (OSA) and those without (nOSA) sleep apnoea. Patients were scheduled to undergo a surgical procedure (Sx). Each patient completed a type of quality of life ...
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2answers
57 views

.999 signifiance query

I am getting the following result for one of my variables after running a logistic regression. Basically I have a set of binary dependent and one independent variable. One of the dependent ...
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103 views

Calibration curve in spss

I couldn't find any tutorials on this on youtube or otherwise. I am validating a clinical prediction model and I have a set of predicted outcomes and the real outcome. I have built a ROC curve but I ...
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1answer
79 views

Tests of within subjects contrasts in R

I have run a split splot model in SPSS (via repeated measures function) and I would like to reproduce my results using R. To do so I used ezANOVA function from ez package to obtain sphericity tests ...
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5 views

Reliability estimate for each item (comparing raters to each other)

I am working with a 15 item scale of pre-school teaching. Five observers observed 58 teachers. Its a complete crossed matrix i.e, all raters observed all teachers. In an attempt to weed out the weak ...
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139 views

multiple chi-squared tests for pairwise comparisons

I have one between-subject factor with four levels, and one dichotomous dependent variable. I want to test if each pair within the between-subject factor is related differently with the dependent ...
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1answer
82 views

How to control for type-1-error inflation with multiple chi-squared tests?

I have two between-subject factors, each with two levels (so 4 conditions). Furthermore, I have one dependent variable (qualitative), also consisting of two levels. Now I want to make pairwise ...
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11 views

two measures at each ordinal variable category

I have an repeated measure (4 total measures) variable of severity, but two measures are high severity and two measures are low severity. I want to test the difference between high and low severity. ...
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1answer
34 views

Correct Stats to Run?

I am doing a study on body image perceptions and physical activity among adolescents. My hypothesis is adolescents who engage regularly in physical activity will have a more accurate perception of ...
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11 views

slowing down effect

I am looking for an algorithm or function to look at the difference in reaction times after negative feedback. The problem is that I need to consider just the times in which negative feedback came ...
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44 views

Correlation significance test with standardized z scores

I am using spss I am looking at a criterion-validity concurrent design. I had to transform two groups performance ratings into z scores because there were differences in how raters rated them on the ...
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40 views

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
81 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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0answers
101 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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0answers
75 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
82 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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0answers
68 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
54 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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85 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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76 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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0answers
67 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
22 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
104 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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28 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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0answers
38 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
22 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
142 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
494 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 ...
2
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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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0answers
85 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
365 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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0answers
38 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
121 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
174 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 ...
2
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1answer
86 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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16 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
148 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
113 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
179 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
42 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
89 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 ...
4
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1answer
275 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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0answers
91 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 ...
4
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1answer
160 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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0answers
87 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, ...
4
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1answer
104 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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42 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 ...