# one-way anova

1. ### Combining variable data

I am working on a nursing biostats assignment and I am stuck on the how to combine multiple responses into SPSS for a one-way ANOVA? I get eight variables listed from the data but want to combine those into three categories (1 positive response, 2 positive responses, and 3 or more positive...
2. ### Normality requirements for One-Way ANOVA, SPSS vs SigmaPlot

Hi, I’m a bit confused about the requirements for normality using a One-Way ANOVA. I had always thought that in order to use a One-Way ANOVA, 2 requirements had to be met: 1 - The data should be normally distributed for each category of the independent variable. That is, say I had 3...
3. ### Quick one please: Difference between 1-way and 2-way ANOVA - Example provided

Hello, I apologize in advance if this is too simple for these forums, but I am just wanted to be very sure. Example: A study that looks at 2 sleep treatments and their effect on 1) how long they think they slept, 2) how rested they feel, 3) how alert they are, 4) how good their sleep was...
4. ### HELP PLEASE :) ANOVAs repeated measures

More I read more I get confused, so please help me ! 1. In 2 (2 conditions)x2 (2 time intervals) within subjects Anova if normality assumption is violated- what is the best option to go about? Ignore? 2. In 2x2 within subjects Anova if I have an interaction effect (all data ok)? Do I...
5. ### Statistical Method to Compare More than Two Sets of Means within a Single Dataset

Hello, I have spent days searching the internet on this subject but I keep turning up an answer for only two sets of means rather than multiple sets of means. I'm re-reading "Adv. Multivariate Stats Methods" but still challenged because I have a single dataset (not independent datasets). I...
6. ### Unequal variances in ANOVA

Non-statistician here, looking for help... My data (data from 8 different populations of plants) when analyzed using one-way ANOVA on SPSS v21 shows that the variances are unequal so the one-way ANOVA can't proceed and I also can't accept Tukey's multiple range comparisons...
7. ### One-way anova or paired t-test on intervention study? OR BOTH?

Hi all. I'm planning a study where I get 3 separate groups of people, make them all do a satisfaction questionnaire, then give each group one different intervention (i.e. 3 different interventions total) and then get everyone to do the same satisfaction questionnaire again after the...
8. ### Anova

I have to compares scores of two nationalities, scores of a questionnaire. I would like to see if there are differences in the score according to nationality, gender, and age groups (three age groups). Should I run a one-way analysis? Equal variances assumed or not? What kind of test would...
9. ### Should I use one-way repeated measures ANOVA here?

Hi, this is my experiment: n users will use 4 different user interfaces (A-D) for exploring the content of a web site. I will systematically permute the order in which they use the different interfaces. After using an interface, a user has to fill out a questionnaire...
10. ### •Comparing groups - which test should I use（t-test or ANOVA)

The general infomation is: We have 6 kinds of material and have 4 group for each material now(please see the attached table) we cut one tooth to two halves(A and B) and bonded two composite cylinder to each half(cylinder 1 and 2). half A is control group(just following the normal bonding...
11. ### ANOVA - one-way vs repeated measures? or both?

What is the best way to analyze this data please? I have 2 groups (treatment group, control group) and 2 time points for each group (day 0, day 1, day 30). I want to (a) compare the treatment group to the control group at each time point, ideally to show that they are not different at day 0...
12. ### Non-pairwise comparison - combining variable levels

Hi, Ive searched forum for similar thread but couldnt find it, if there is an identical topic, please let me know Ive got an independent variable Education with 4 levels: Primary, Highschool, Undergraduate and Postgraduate. And I have to compare Primary & Highschool vs Undergraduate &...
13. ### [Matlab] One-way ANOVA with 2 covariates [HowTo?]

Hello everyone, (Big hello, my first post in this forum!) I was wondering how to do a one-way ANOVA with 2 covariates in Matlab. The problem is that I work with a variety of scripts and most are realized in matlab; also, I have absolutely no knowledge of R or any other powerful language...
14. ### Some questions about one-way ANOVA in JMP 9

One-way ANOVA can be used to estimate the contribution of a variable (x) to the variation in another one (y). I have some questions about it: 1. How to perform it in JMP 9? I am eager to get the R square. 2. Is this R square identical with the one by multivariate regression? 3. In ANOVA, is...
15. ### One-way ANOVA with unequal sample sizes

Please ignore question no longer need help - thank you for all of your responses!