SPSS (Statistical Package for the Social Sciences) is a proprietary cross-platform general-purpose statistical software package.
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29 views
Goodness of fit vs. significance
If you had two models - one with a better fit, and one with predictors of higher significance - which one would you choose?
Keep in mind that both models are considered a good fit. One has a 3% ...
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0answers
10 views
Post-Hoc for 2x6 Mixed Design ANOVA
I have run a 2 (gender) x 6 (A) mixed design ANOVA. While I found a main effect for A, the interaction was also significant. While attempting to run post-hoc through SPSS, it said that I was unable to ...
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0answers
15 views
Partial $\eta^2$ in multivariate analysis
I wonder why the partial $\eta^2$ values are so small in my SPSS GLM Multivariate analysis. I have 3 DVs and 5 IVs and the sample size is large (n=5000). The main effects and significant but the ...
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0answers
20 views
mediation analysis interpretation
I am carrying out a mediation analysis using PROCESS in spss. According to Field a mediation effect occurs if the confidence intervals for the indirect effect do not include 0 - this is the case but ...
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1answer
61 views
Covariate vs. factors
I have a survey problem where the dependent variable (ordinal) is in Likert-type scale (i.e. 1 to 5 from most satisfied to most dissatisfied) and two sets of independent variables. One set has 7 IVs ...
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1answer
35 views
Repeated Measures ANOVA with several measures entered together: how to find main effect
I've run a 2 (treatment and no treatment) x 2 testing occasions (pre and post) Repeated Measures ANOVA. In addition, I entered several tests given at both time points, so under the Repeated Measures ...
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2answers
60 views
Is partial correlation possible after Spearman's correlation?
I have two test groups that conducted an online task measuring response times (avg, avg(congruent), avg(incongruent)). I expected one group to be faster than the other but it turned out exactly the ...
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0answers
18 views
GLMM in SPSS: what does significance of the fixed coefficients mean?
I conducted a GLMM analysis in SPSS with y~a+b+a*b.
The output result contains two tables:
the fixed effects, for which the main effects and the interaction ...
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2answers
96 views
Differences in kurtosis definition and their interpretation
I have recently realised that there are differences in the kurtosis values provided by SPSS and Stata.
See http://www.ats.ucla.edu/stat/mult_pkg/faq/general/kurtosis.htm
My understanding is that the ...
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1answer
37 views
Setting up data for MANOVA in SPSS
I do not understand how to arrange my data in SPSS for running MANOVA.
I have 6 groups of participants that have rated 100 pictures on 3 different dimensions (dim1, dim2, dim3).
What I don't ...
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3answers
39 views
Interpret significant interaction but no main effect in repeated measures ANOVA
I have a model in which two groups are measured on one DV at pre- post- and 3 months following an intervention (the control group did not receive the intervention). I have an interaction effect, which ...
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2answers
72 views
Comparing two sets of time-series (physiological measures)
I need help in finding which statistical approach I need to use.
I have two groups: G1 (disease) and control.
For both groups we measured their blood level every 10 minutes: 0 to 650 min.
We are ...
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16 views
How to compute chi-square post hoc multiple comparison tests using Complex Samples module in SPSS version 20
This questions refers to computing cross-tabulations and chi-square tests of independence through the SPSS complex samples module available in SPSS versions 19 and up. I am able to compute the overall ...
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1answer
55 views
Why do Minitab and SPSS give opposite results in Ordinal Logistic Regression?
I run an ordinal logistic regression model using both SPSS and Minitab. The dataset is exactly the same. The results are exactly the same, but in opposite directions. I have not manipulated default ...
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37 views
Suggestion for statistical analysis. Is generalized estimating equation (GEE) a good option?
I have two groups a G1 and control. For both groups we measured their cell counts every 10 minutes: 0 to 650 min.
We are trying to find:
Difference (in cell counts) between G1 and controls - ...
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1answer
72 views
CHAID vs CRT (or CART)
I am running a decision tree classification using SPSS on a data set with around 20 predictors (categorical with few categories). CHAID (Chi-squared Automatic Interaction Detection) and CRT/CART ...
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2answers
50 views
Finding latent variables in 7 dichotomous variables
I have read other posts on conducting Factor analysis (FA) with dichotomous variables and although it appears clear that FA done in the default way is not appropriate, I am still unclear about a few ...
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0answers
71 views
How to correctly estimate statistical significance of regression coefficients?
Say that I want to determine the statistical difference between the coefficients derived from the FF three factor model of two portfolios (Spe and ...
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1answer
60 views
How to calculate validity of questionnaire in SPSS?
I have 3 types of questionnaires,
A 15 item scale with each item on a 7-point Likert type scale.
Six subscales each containing different number of items
21 subscales each containing 4 items.
...
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2answers
73 views
How to test a curvilinear relationship in a logistic regression
I was looking for some information about curvilinear relationships (quadratic function, to be precise) in logistic regression online, and couldn't really find much about it.
I am interested if that ...
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1answer
32 views
Data analysis using matched design - SPSS help
I would love to get some advice regarding the following please!
I am involved in a study that is looking at cognition across 3 separate groups (1= the clinical group of interest; 2= clinical control ...
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1answer
41 views
Interpreting multivariate tests in repeated measures
I have a within subjects design with 4 DVs and I ran a repeated measures analysis on SPSS. My DV is a physiological measurement and is not expected to be linear.
My multivariate Wilks lambda is ...
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0answers
26 views
How to test for significant difference between 2 binary variables in one sample [duplicate]
I would like to test if there is a significant difference between the pre-test and post-test in a dichotomous variable (0 = "False", 1 = "True"). I'm using only one sample of 30 subjects.
So, my 2 ...
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2answers
151 views
What are the implications of a perfect fit model?
I perform logistic regression with a relatively small dataset (N=65), using 12 parameters (11 variables, one constant, no interactions), which results in a perfectly fitting model (in SPSS). I have a ...
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3answers
92 views
Difference between binomial, negative binomial and Poisson regression
I am looking for some information about the difference between binomial, negative binomial and Poisson regression and for which situations are these regression best fitted.
Are there any tests I can ...
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1answer
64 views
Visualizing an interaction effect of a Logistic Regression Analysis (in SPSS)
What would be the best way to go about visualizing an interaction effect of a Logistic Regression Analysis (preferably using SPSS)?
There is a significant interaction between one interval (HDI) and ...
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1answer
85 views
Replicate ANOVA with linear mixed model in SPSS
I am trying to replicate a mixed ANOVA using a mixed model, but the mixed model is giving me different results. I'd like to know why, and how to get them to give the same results, assuming this is ...
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2answers
88 views
Bonferroni adjustment in SPSS - what does it do?
first post, so go easy...
I'm probably being a bit simplistic here, but from what I understand the Bonferroni post hoc test is simply when we adjust the alpha to account for inflated error when ...
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0answers
30 views
How to code separate data for a regression parameter in nonlinear regression?
Say I have a bunch of measurements over a range of my independent variable (example data at the end) and I want to fit them to an equation such as a classic pharmacological inhibition curve:
...
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2answers
99 views
Choice between Type-I, Type-II, or Type-III ANOVA
We have a dataset with three variables (dV: self-reported measure on scale 1-5, assumed to be metric; iV1: factor with 4 levels; iV2: factor with 8 levels). We are interested whether the dV differs in ...
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43 views
IBM SPSS plot multiple variables [closed]
I have time-on-task data for three different designs from a website usability study. How can I visualize multiple variables on a bar chart or a stacked bar chart(clustered by user experience) with ...
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0answers
14 views
Reduce Sample Size (Categorise??) [duplicate]
I have been looking for an answer to my question but havn't been able to find any literature documentation or help in regards. I have a large dataset which I need to further analyse. Because of this I ...
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0answers
46 views
Compute Hedges' g in SPSS syntax [closed]
I've got a bit of a problem with an SPSS syntax which I'm not sure it does what I actually want it to do. It's adapted from the calculation of the d effect size (Andy Field's macro) and I've included ...
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39 views
Multiple regression with dummy variables
I need to calculate MR but my data consists of many dummy variables. I had a question in my survey that asked for the budget/month. But instead of giving the option to fill in a value, I offered ...
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1answer
76 views
Which statistical method should I use?
I wish to analyse the following :
Independent Variable (IV): User of online financial reports Perceived usefulness and Perceived Quality (Sub to Relevance, Reliability, Understandability, ...
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21 views
Conjoint analysis based on a orthogonal design [migrated]
I'm having some issues regarding a conjoint analysis. Excuse me if some of the terms I use are wrong, but it has been some time since I last worked with SPSS - and my teacher was Danish.
Task ...
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29 views
Formula for computing variable from Likert-type scale
I have this model:
$$4F + 4.8N = a + bM +cP + dH$$
where $F$, $N$, $M$, $P$, $H$ are variables measured on a 7-point Likert's type scale and $b, c, d$, are coefficients and $a$ is a constant. I am ...
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1answer
66 views
SPSS: Plot a multinomial logistic regression
Very simply, I'd like to plot a graph that compares what is predicted by the model to the real observations.
It seems easy for binomials, but for multinomial the graph that SPSS creates is pretty ...
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52 views
What does the Scale parameter mean in linear regression?
I have started to use the GENLIN procedure in SPSS more than any of the specific dialogues, but I don't understand the Scale parameter or why it has the effects it ...
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1answer
81 views
Two-way ANOVA, what to do next?
I used a 3x2 between-subject ANOVA to examine the effect of colour (three levels: colourless, light red, and dark red) and odour (odourless or not) on perceived sweetness. The results indicated ...
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66 views
A randomized, double-blind crossover (AB/BA) observational study of new use of an FDA approved drug
I found a new use of a drug already in use. The results are as follows.
Serail No. of Patient-- Attacks while on Placebo-- Attacks while on drug --Difference in the no. of attacks
1- 23- 2- ...
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0answers
74 views
McFadden R Square
I did multiple regression analysis, and i have one little problem about interpreting the output. What does McFadden R-Square means, if it is 0,196. What it shows me? Is Mcfadden the best solution, or ...
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1answer
80 views
What does it mean to have negative values for both lower and upper bounds on a 95% Confidence Interval on ANOVA?
My data shows 95% CI = [-1.07, -0.40], what does the negative sign indicate and how do I interpret the data? as I think it is significant for not capturing the value of 0.
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1answer
78 views
ANOVA result indicated that there were sig. differences while Tukey post-hoc test revealed that there were no statistically sig. differences [duplicate]
I was conducted one-way ANOVA analysis to examone the level of knowledge shaorng among the employees based on there age differences. One-way ANOVA indicated that there were significant differences in ...
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0answers
131 views
GEE (or GLMM) in SPSS: Interpreting outputs and model selection
I am attempting to analyze my (experimental psych) data in SPSS, and I have a few questions regarding the kind of analysis I should be using (GEE or GLMM), how I should be interpreting the output, and ...
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2answers
90 views
Help with Anova of categorical and continuous variable in R and SPSS output
I am having some trouble running an Anova on categorical variables in R and matching SPSS output. What I need to do is run an anova on the dataset below (its a made up data set). But, I need to know ...
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26 views
ANOVA for comparing methods: how to order the data
I'm going to run a series of tests for comparing different methods and combinations per two of those methods. And I was wondering how I'd best order the output so that I can easily use it in an ANOVA.
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1answer
55 views
How can I interpret binary logistic table?
I´m beginner with SPSS and I have on problem on interpreting binary logistic results. So I have this table:
Variables in the Equation
...
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1answer
107 views
Why does SPSS throw out variables in OLS (and how can I prevent this from happening)?
My dataset consists of 4,000 companies from 24 countries. Each company has certain features, the IV's. Consider the variable list below: green is the DV, red the IV's and blue are dummies (one for ...
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1answer
32 views
Need help selecting test for nominal IV with categorical DP
I am going to attempt to give you as much background as possible.
My independent variable is nominal and describes the number of days after which an insect was exposed to new conditions (0,1,3,5,7).
...
