Tagged Questions

1
vote
0answers
39 views

How to test for differences in 3 related measures assessed pre- & post- treatment on the same sample?

I am designing a study to compare whether one specific treatment improves Quality of life. I am using a convenience sample ($N=20$). I hope to administer three ...
0
votes
0answers
76 views

Comparing max/min over several time points against baseline

I have a time-series dataset with repeated measurements (multiple subjects). I have around 100 variables to test. The question is - Is something happen in a time range independently on exact time? For ...
0
votes
2answers
53 views

Paired Differences T-tests for Odd number of Observations

Suppose we have $m$ baseline data points and $n$ post-baseline data points where $m < n$. This is for one subject. Is it possible to perform a paired t-test on this data even though $m+n$ is odd? ...
3
votes
3answers
1k views

Which t-test to use for a two-group pre- post-test design?

I have data on 26 participants (13 from computing and remaining 13 from non computing) who have participated in my research. Each participant is treated with a lab module (Hands on Robotics Session). ...
3
votes
3answers
307 views

How to test whether average of ten independent correlations is different from zero?

I have calculated the correlation between A and B for 10 different subjects. For averaging purposes, I've converted the r-values to z-values using Fisher's z-transformation. ...
2
votes
1answer
1k views

Paired t-test as a special case of linear mixed-effect modeling (still unresolved)

We know that a paired t-test is just a special case of one-way repeated-measures (or within-subject) ANOVA as well as linear mixed-effect model, which can be demonstrated with lme() function the nlme ...
3
votes
1answer
1k views

Handling outliers when comparing two means in a repeated measures design

I am doing a simple study that involved taking a measure at time point 1 and time point 2 (12 weeks later). While the sample was a class, not all members were present at both time points, so I have ...
2
votes
1answer
1k views

McNemar’s test or T-test for measuring statistical significance of matched-pre-post-test result

I have a question on selecting the appropriate statistical test as below: I have a group of people attending a training course, in order to measure whether the training course is effective in ...
4
votes
2answers
531 views

What type of data analysis (ANOVA) should I run on this experiment?

I am not sure how I would analyse this data: The experiment is looking at the accuracy of emotion recognition in children with ADHD. The children will be asked to identify what emotion a face is ...
1
vote
1answer
2k views

How to examine differences between two groups across three different experimental conditions?

I have data for two groups. The 2 groups are matched on a number of variables, but differ in the scores on an alcohol measure (one group is high, and one is low). However the groups have been created ...
3
votes
3answers
267 views

Test to compare user interfaces

For my thesis I will need to do an experimental user study to compare two user interfaces which both can perform the same tasks. They differ in how they support you in achieving your task. I'm not ...
7
votes
1answer
225 views

What article or book clearly states that one can't use protected t-tests in within subjects ANOVA?

I have been asked to use protected paired samples t-tests in an analysis. The requester states that if I do not use the overall MSe from my (1 factor with four levels) within-subjects ANOVA when ...
5
votes
3answers
6k views

What is a minimum sample size for a paired t-test and what is a non-parametric equivalent if data is non-normal?

I have 4 sample pairs, let's say (x1, y1),...,(x4, y4). What is the minimum sample size for a paired t-test? Which assumption should I check for paired t-test? If my data is non-normal, what is an ...
2
votes
1answer
277 views

Significance test for differences in baseline and remeasurement rates between two groups

I need help in knowing which test to perform with this analysis. I have two groups (lets say group A and B). A study was performed with initial rates of heart failures in group A and B (i.e, ...
3
votes
3answers
237 views

Significance test of whether participants have more friends of the same sex

I've run into a simple problem - but no idea how to access it correctly. I've 85 people asked concerning their social network; first example: how many friends do you have. Second, what gender is each ...
0
votes
0answers
72 views

Detecting significant differences for each stimulus using ANOVA repeated measures [duplicate]

Possible Duplicate: Wrong results using ANOVA with repeated measures Hello everybody, I did an experiment and I need to understand how to detect, by means of an ANOVA (repeated measures), ...