# anova

1. ### Confused about what type of ANOVA is required

I'm doing a study for university which involves a series of participants (about 150), undertaking a study with 3 conditions and a control condition. The participants are all of different ages and are both male and female (though not an equal number of each) and all participants see all...
2. ### Within-Subjects ANOVA with low sample

Hello, I have some data that I want to analyse. It is 2x2 within-subjects design. My DV is continuous and the two factors have 2 categorical levels. But I only have 8 subjects, so I am unsure about how to proceed. Is it correct that there is no reasonable alternative to just using an ANOVA? If...
3. ### 2-sample t-test shows no equal means, can I still compare capabilty analysis and Ppk's?

I want to compare two categorical situations (old vs. new part in a machine) with the continuous CTQ, the y-variable. In order to compare the 2 situations, I found the proper distribution and compared the two Ppk values. I saw a significant difference in performance (the new part was +-3 times...
4. ### degrees of freedom with a mixed anova design

Hello - I am trying to figure out why my degrees of freedom are decimals rather than being whole numbers. I am running the mixed anova in R and the assumptions have all been met. The sample sizes of the two groups are unequal. Would this be an explanation? Or could it be that there is a...
5. ### Manova, Hotelling's T^2, t-test or Anova?

Hello, For my final thesis, a few questions arose during the pre-registration process and I would be very happy to receive answers. I will conduct an experiment with three groups (1, 2, 3) and 3 dependent variables (a, b, c) to find answers to the following 2 hypotheses: H1: M(2) > M(1) -...
6. ### two way ANOVA?

Dear all, I'm new to statistical analyses and currently using SPSS, and my question is: is the two-way ANOVA the right approach for my case? Because while analysing the data it was noticed that will only have one position, meaning that group would be repeated many 3 times more than single...
7. ### ANOVA with missing case

Hi All, I was wondering if anyone could shed some light on a current situation I have encountered. I have a study set-up with 13 participants that I am examining over 5 time-points, hence, I intend to conduct a one-way ANOVA. However, on one of the time-points, a participant was unable to...
8. ### Measuring categorical (race) and two continuous varibles

I need your help to identify which test I have to implement for measuring the correlation of one categorical and two continuous variables. In my study I have two constructs: 1- information consumption from credible sources (CS)--4 items(ie., information consumption from CDC website) 2-...
9. ### Testing two independent variables (categorical and interval) and interactive effects on continuous data?

Hi, I'm not sure if there is an actual statistical test for this, but I want to see how Side (Left or Right, categorical) and Depth (Interval, fixed at every 250, but I don't have data for all depths) affect a continuous parameter I have. I initially tried a multiple linear regression, I am...
10. ### Comparing quantiles from one sample

Hello! I'm looking to determine factors that play a role in a country's life span. I want to split the countries up using the percentiles from life expectancy (i.e. 0-25%, 25-50%, 50-75%, and 75-100%). My rationale behind this is to understand how countries with lower life expectancies compare...
11. ### ANOVA on three columns?

Hi all! I am new to this forum so hopefully this will be a success! I have some data in excel from 3 experiments that are run independent from each other (they do not influence one another). Each experiment has 10 runs each. All the data across the three sets of experiments (i.e. 30 runs) have...
12. ### Normality test in data with multiple treatments

Greetings. I have to test for normality to know if I go the ANOVA route or the Kruskal-Wallis route and I don't know how to go about it. I have an experiment with the setup shown in the attached image. I have several treatments, within each treatment I may or may not have independent reactors...
13. ### Which approach to evaluate small spatial variations in temperature?

I am evaluating whether utility-scale solar energy plants affect the surrounding climate (initially temperature). An effect has been found in one paper using the approach described below/attached but when repeating this approach I find no effect for the same site. I want to be sure that there...
14. ### Unequal sample size of 2 groups data. Will it affect the ANOVA result?

Hi All, I have a doubt. I have a dataset attached in the below image. I am doing ANOVA on the dataset to findout Dosage have a significant effect on Injected_timing. But I have unequal data(For person1 , there is 2 morning and 1 evening data. For person2, there is 2 morning and 1 evening...
15. ### SPSS - Using mixed univariate ANOVA (UNIANOVA) or mixed linear regression (MIXED) instead of repeated-measures ANOVA

Which process is better for using instead of Repeated-Measures ANOVA (SPSS syntax: GLM -- GUI command: Analyze --> General Linear Model --> Repeated Measures)? and Why? (1) Mixed univariate ANOVA (SPSS syntax: "UNIANOVA" -- GUI command: Analyze --> General Linear Model --> Univariate) (2)...
16. ### Standard deviation from ANOVA-table

I am trying to find an estimate for σ , based on the ANOVA-table under, but I dont know where to start. Is it possible to find the estimate for σ from the residual standard error? if so, how?
17. ### Help deciding which spss functions to use

I'll start off saying that stats in general has never been a strong point for me :D The variables i am using are; Gender Age Relationship Status Number of dependants Profession Neuroticism (Higher score = higher neuroticism) Affectivity (Higher score = positive; lower...
18. ### Do I need a two-way MANOVA test?

I am testing for differences between 3 groups. I have 2 dependent variables which are continuous data. However, I am confused about my independent variables and if a two-way MANOVA test would be suitable. My three groups are Rural, Semi-rural and Urban (3 groups). For each group I am testing...
19. ### Which test for hierarchical within-between design?

Hi everyone, I'm about to design an experiment with one independent variable of three levels. However, two of the levels can be 'grouped together', and I'm quite unsure about if my experiment design makes sense, and even more important, which statistical test I can use for evaluation. For...
20. ### Should I use repeated measures ANOVA or one-way ANOVA?

I am conducting a study on different image reconstruction algorithms for computed tomography (CT). My aim is to investigate which of the image reconstruction algorithms that have the highest signal-to-noise ratio (SNR). My dataset is 100 patients who underwent a CT brain scan. Each CT scan will...