Tagged Questions
1
vote
1answer
64 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 ...
1
vote
1answer
51 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.
1
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1answer
45 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 ...
1
vote
2answers
71 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 ...
0
votes
0answers
22 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.
...
2
votes
1answer
49 views
How can I perform post-hoc tests to the ANOVA performed during K means clustering?
If I have highly dimensional data and perform k means clustering, I can end up with clusters that differ more on some axes than others.
SPSS provides the option to return an ANOVA for each variable, ...
4
votes
2answers
115 views
R p-value half to SPSS rANOVA
I have done rANOVA in SPSS and then in R and got two different p-values from the same model. While SPSS gives 0.032, R gives 0.0162, which when rounded is a half. Other data are exactly the same.
1. ...
2
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1answer
70 views
Why is ANOVA interaction no longer significant after including a covariate?
I have initially run a 2x2x2 Anova and found some significant interaction between the independent variables. I then ran a ANCOVA where I added a covariate. I am confused with how to interpret the ...
-1
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0answers
16 views
how to get covariates for these type of data [closed]
i have data on teachers-students responses on the usage of some particular teaching methods, I intend to use ancova for the analysis but don't know how to get the covariates. please advice me?
0
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0answers
28 views
Non-significant results
I conducted a between-subjects study and all my results were non-significant.
Now, for a repeated measures I know you go into Mauchlys when reporting, but since my study
isn't a repeated measures but ...
1
vote
0answers
106 views
Repeated measures ANOVA: Mauchly's test undefined
I'm doing a two-way between-within ANOVA in SPSS. I have two groups with 9 subjects each (so total = 18), and 24 levels of one repeated measure.
I understand why Mauchly's test of Sphericity has no ...
1
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0answers
69 views
What statistical methods to use for analysis of a scenario questionnaire?
I've produced a questionnaire with 3 parts, demographics, attitude questions, and then a final section on particular scenarios. I'm looking to analysis people's response to the scenarios - as in what ...
0
votes
2answers
97 views
How to analyse three way ANOVA that also has pre-post and one within subjects factor?
I'm currently having a problem understanding on how to enter and calculate my data in SPSS.
I have a three way design in which there are 2 variables each in
Experts vs Novice;
Guided Discovery vs ...
0
votes
1answer
116 views
Two-way ANOVA repeated measures
I would like to know, if you got a significant interaction in a two-way repeated measures ANOVA in SPSS, how can you visualize the interaction (especially using syntax)?
0
votes
0answers
388 views
How do you interpret the test of between subject effect in mixed ANOVA?
I am doing research on perception and writing styles.
I subjected my participants to 2 type of writing styles and a pre test and post test to measure their perception. I have done a repeated ...
2
votes
1answer
183 views
Checking normality of residuals in 2x2 mixed methods ANOVA
I am running a 2x2 mixed method ANOVA (with one between-group factor and one within-group factor - time 1 and time 2). I want to check whether the assumption of normality of residuals is met. When I ...
0
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0answers
155 views
Comparing the results of one-way-ANOVA and two-way-ANOVA
I don't know how to interpret the results of my one-way-ANOVA and two-way-ANOVA.
I have 2 independent variables (s.b.'s trust in the internet="v_563" and internet usage(frequency) = "v_614"). I ...
0
votes
0answers
504 views
SPSS Anova mixed between-within subjects. Which is the correct way to compare main effects?
I counducted a mixed model ANOVA with time as the within subjects variable (3 levels) and group as the between subjects variable (2 levels). All is significant (time, group, and timeXgroup).
I don't ...
1
vote
1answer
144 views
Variances not homogeneous problem in ANOVA mixed between-within subjects, too bad?
I'm conducting a 2x3 mixed between-within subjects ANOVA (group x time). I have 20 participants, 10 for each group, who undergo all the 3 measures over time.
Levene's test of equality of variances is ...
0
votes
1answer
474 views
Normality test for anova mixed model in SPSS: I did it in two ways but the results are contrasting
I'm conducting an ANOVA mixed model 2 X 3 (group X condition). Right now, I'm checking for the assumptions of ANOVA, such as normality. I should check indipendently for group and condition, right? I ...
5
votes
2answers
1k views
Post hoc test in a 2x3 mixed design ANOVA using SPSS?
I have two groups of 10 participants who were assessed three times during an experiment. To test for differences between groups and across the three assessments, I ran a 2x3 mixed design ANOVA with ...
3
votes
2answers
685 views
Calculating eta squared from F and df
I'm trying to compute ANOVA effect sizes from papers that provide an F value without other information. If I understand correctly, the effect size for a single-factor ANOVA is
$$
\eta {2} = ...
2
votes
2answers
226 views
How to do repeated measures ANOVA for two groups in SPSS and 12 time points?
I am measuring one parameter (say weight) repeatedly at different time points (say monthly, for 1 year) for two groups (say experimental and control groups). My data looks something like data posted ...
2
votes
0answers
55 views
ANOVA variable that is both BETWEEN & WITHIN
Does anyone know how / if can you treat an independent variable as BOTH a between AND within subjects variable (ideally in SPSS ANOVA-repeated measures). That is, we have a repeated measures study ...
2
votes
1answer
177 views
Justification for low/high or tertiary splits in ANOVA
I have two groups of participants and they all took the same measurements.
When I perform a median split on one of the measurements to test my hypothesis about an interaction, the dependent ...
2
votes
1answer
68 views
When are tertiary splits un/justified?
I'm studying neuroscience and have a question about presenting some data. I would like to know if tertiary splits are acceptable when the variable in question is normally or not normally distributed. ...
2
votes
1answer
406 views
Testing anova hypothesis with contrasts in R and SPSS
Using data and answers from this question I was trying to test the hypothesis $H_0:-3\mu_1-\mu_2+\mu_3+3\mu_4=0$
...
0
votes
1answer
393 views
What does it mean to have an F-value of .000 and Sig. of 1.000 (in SPSS)?
We conducted this very simple 2x2 Between Subjects Factorial Design Experiment, where the DV were their answers to a classic insight problem. Since there is only one correct answer to the problem, the ...
-1
votes
1answer
95 views
How can I change the scores to make interaction effect in two way ANOVA significant?
My question is how to make an interaction effect become significant in two-way ANOVA.
If my main effect A has an F value of F(1,80)=25.5 for example, and my main effect B has an F value of ...
1
vote
0answers
244 views
Mixed linear model with repeated measures in SPSS
I'm trying to run a mixed linear model analysis with SPSS. When I try to run the analysis, SPSS gives the following error message: ...
2
votes
0answers
212 views
Split-split-split plot cross-over design… is this even possible?
I'm doing statistical analysis on a psychology study I ran a short while ago, and I'm starting to think that I've designed myself into a corner.
In the study, we measured participants' pointing ...
2
votes
1answer
801 views
How to interpret an interaction effect in SPSS output for a repeated measures anova with between and within group factors?
I have conducted a repeated measures ANOVA, with 2 factors:
One between factor (Ex_control: exercise intervention versus control)
One within factor (...
1
vote
0answers
424 views
Difference between MANOVA “post-hoc” tests of between subjects effects and between subjects one-way ANOVA?
When I run a 2x4x5x6 (Sex*AgeGroup*HighestDegree*Ethnicity) MANOVA (with 20 dependent variables) in SPSS, it presents tests of between subjects effects for each of the IVs and their interactions after ...
1
vote
2answers
368 views
How should I analyze data with repeated measures variables and integer between-subject factors?
I ran a study, where a single variable was measured repeatedly for each participant, under different conditions. Analyzing this data with SPSS has been rather straightforward, by using the General ...
0
votes
1answer
157 views
How can partial eta squared be 5% and yet SPSS says 0.045?
The partial eta squared indicates that gender explains 5% of the variance in drugs and ethnicity explains 6% of the variance in drugs. These are small effect sizes.
I am not sure I understand this ...
2
votes
1answer
98 views
How to determine if a change in F value when introducing a covariate, is significant?
My question may be very basic but I hope that you can help me.
I have got two groups (A and B). I am measuring two continuous biological measures (X and Y) which are significantly positively ...
0
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0answers
296 views
Friedman's Anova on qualitative data in SPSS
I have some qualitative data and having trouble preparing the data before I perform the analysis in SPSS. My understanding of Friedman's anova is that the data must be ranked from lowest to highest.
...
2
votes
1answer
969 views
How to analyse multiple between subjects factors in a mixed ANOVA in SPSS?
I am performing a Mixed between subjects Anova where I have multiple time points that subjects have completed a measure at.
The within subjects factor is time.
The between subjects factors include ...
1
vote
0answers
207 views
non-collapsed data - repeated measures mixed ANOVA
I have to analyze results from an experiment and I’m not sure about how could I do it… The experiment is about the effect of some particularly distorted image typology on response time.
The design is ...
2
votes
2answers
2k views
Repeated measures ANOVA or Friedman test?
I have a study with 35 subjects who received hypercoagulability testing at 4 different times (before surgery, after, at 1 week, and at 1 month). Each subject has 9 different test of hyper ...
0
votes
1answer
303 views
How to do a repeated measures ANOVA with missing combinations in spss
I currently have a setup, for which I want do do an ANOVA in spss. In my model I need to include four factors (I'll call them factor1 to ...
-1
votes
1answer
433 views
Where are the t-values in my pairwise comparisons?
I have data from a study with three conditions. The independant variable was within-subjects and within-items.
I did an F1 and F2 analysis (= twice a repeated measures anova) on the averages, by ...
4
votes
2answers
2k views
How to test for normality in a 2x2 ANOVA?
Study Design: I showed participants some information about sea-level rise, focusing the information in different ways, both in terms of the time-scale and the magnitude of potential rise. Thus I had a ...
1
vote
0answers
178 views
Aligned rank transform on time series data
I have some time-series data that I wish to test to see if a certain factor has an effect. There are few samples per time step (10 on average), but the whole time-series has 306 samples. When divided ...
1
vote
1answer
958 views
Justification of aggregation in multi-level model - ICC in SPSS
I am running a multi-level model on data which is set out with one row per individual survey return, each with Individual ID and Organisational ID as columns. There are variables which can be ...
3
votes
3answers
3k views
How to assess differences between three groups in a pretest - posttest design using SPSS?
I have a dataset that includes one independent variable with 3 levels (group 1, group 2, and group 3) and a repeated dependant variable (pre test score, post test score).
I am using the statistics ...
1
vote
1answer
3k views
Estimated Marginal Means or means from descriptives?
I'm currently looking at a 2x2 Repeated Measure Anova for an undergrad project but I'm struggling to find information about which means to report.
I will be reporting the Within-Subjects Anova,the ...
1
vote
1answer
421 views
How to interpret 3-way interaction with one continuous variable in mixed model
I have problems interpreting the direction of the effects in my model. Can you help me with this?
I conducted an experiment which includes
between subject factor:
group=2 (coded as 0-1)
within ...
1
vote
1answer
310 views
Converting Bs parameter estimates into Betas
I have unstandadized B coeff.s in my parameter estimates for ANOVA. How can I use Beta=B(SDx/SDy) to convert them into standardized B's (Beta's).
Why doesn't SPSS do this for me, like it does in ...
2
votes
0answers
111 views
How to do post-hoc contrasts on within factor depending on certain between groups in SPSS?
Here are my experimental factors:
within-factor (two levels): time1, time2.
between factor (four levels): 4 groups.
I want to test specific post-hoc contrasts comparing:
group1: time1 vs. time2
...
