# experiment

1. ### standard deviation of a division

Hi, I have a rather easy question: I have a batch of different dried fruits, let's say n=100, with a diameter of 8±2 cm, 2 being the standard deviation. After throwing them in water the distribution of the batch's diameters is let's say 16±5 cm because of the swelling. This results in a size...
2. ### Best way to say something about the accuracy of a measurement

Hi, I'm an engineering student and encountered a problem to which I did not find a solution yet, and wondered if someone could give me the benefit of their expert opinion. I'm going to perform an experiment in which I'll cook an egg using standing electromagnetic waves, only for a short period...
3. ### 2x2 design: compare the increase within two treatments

Hi, I am currently evaluating a 2x2 experimental design. Let's say the two independent variables are A and B with the manipulated levels (A1 vs. A2) and (B1 vs. B2). The dependent measure is performance (as a percentage score). I hypothesize that performance is higher in treatment A2 compared...
4. ### How to deal with non-proportional hazard Cox models?

Dear all, I want to run a Cox model to see if there is an interaction between two treatments. However, the test to see if proportional hazard is respected suggests that it is actually not respected. So I don't know what other statistical survival analysis to do because it means I cannot rely on...
5. ### Can I use a set of LSTMs to simulate counterfactual states?

Motivation: I have a system comprised of three probabilistic boolean timeseries and I want to simulate how two of them would react, if a certain intervention would take place (lets say, timeseries 1 can be influenced and will definitely be "0" for the next 6 observations). (The managerial...
6. ### We did an experiment and don't know how to start/proceed with statistics?

We had to do an experiment in my research methods class. Me and my group did an experiment where we tested if participants remembered words better with or without pictures that match the words. So now we have two sets of data: One set with the number of words they remembered and one set with the...
7. ### Partial least squares (path analysis) - why and how to interpret attached results?

For my research, I have a model with various mediators and one moderating variable (see image). I derived my data from an experiment. Short summary: - Incentive structure is the main IV (three treatment groups) - Risk behaviour is the DV (continuous variable) - Accountability is another...
8. ### SPSS: regression analysis for 3x2 experiment. How to test for interaction

Dear all, For my research I have the following facts: - I have two categorical IVs: - treatment condition called competition, which has three conditions ("low", "medium" and "high") - Another factor that is given to half of the group, called accountability (two options...
9. ### Estimation of suitable significance level for high numbers of experiments

I am a scientist and work with high numbers of experiments. For example: I have tested 1000 different parameters between 2 groups. I found 10 parameters, which are significantly different between the tested groups with a significance level of 5%. For only 1 tested parameter it would be...
10. ### [AMOS] Model with a categorical IV

Hi all, I am looking for some AMOS advice regarding an experiment I've conducted, with a categorical IV. How should I include this categorical IV in AMOS? Experiment background: Participants in the experiment received a news item about brand A, brand B, or brand C (3 different types of...
11. ### Between Subjects Experimental Design- How to analyse

I have conducted an experiment with 2 conditions, 50 people in each condition. Each person completed a booklet of tasks and self-report measures (the same booklet in each condition). I have conducted a simple T-test and have found significant differences between the two conditions on the...
12. ### Help needed to check statistics in thesis

I would really need someone to check my stats work for my thesis, as I am not entirely sure about what procedures I carried out. Quick overview of my my experiment: - I investigated 2 methods of using worked examples to study the division & multiplication of fractions in 2 year 7...
13. ### MANOVA design

Being rusty, I would be grateful for a quick confirmation of MANOVA being an appropriate model: I have one dependent variable but 6 independent ones: group (3 levels), subjects per group (a variable number, between 11 and 110 subjects) and then the experimental variables: stimulus (3 levels)...
14. ### test of significance for comparing change between two groups

What test for significance is best to use to test the difference between the change of a categorical variable in a control group and the change in a pilot group? I do not think I can simply compare the 'after' for each because the 'before' for the two groups was statistically different - they...
15. ### Experiment With Fictitious Data

After a semester full of open-note/curve graded exams and very few homework assignments, our stats professor decided that our final project would weigh heavily on our term grade...and since we only have the weekend to complete it and haven't actually learned anything in class...none of us know...
16. ### Subject responses in multiple period experiment

Hello Everybody, In an experiment, players play a game for 30 rounds. In each round, they choose either good A or good B. In various treatments, the incentives are changed in some way. I am interested in studying the difference in frequency of choosing good A in a control vs a treatment...
17. ### 2X2 design ANOVA SAS

Hello, I am beginner with statistics and I need some help for my data analysis. In my research I am trying to find an impact of colors on websites and types of webstores on customer trust, purchasing intention, preference etc. For example websites selling insurance service will be trusted more...
18. ### Fixed effects versus standard errors

I have experimental data from a correspondence test in the rental housing market. On which ground should I choose between: 1) F.E. for the region where the apt is and cluster s.e. on the day I sent the message 2) cluster s.e. on region and F.E. on day when the message was sent (or...
19. ### pre- post- intervention survey analysis

Hi all, I am trying to figure out how to analyze survey results administered as part of a randomized trial. We drew random samples of households from 4 different locations: 1 neighborhood which received treatment a, 1 neighborhood which received treatment b, 1 neighborhood that received...
20. ### How to test for differences in binary score data

I have data from a human subject study that was setup as a 3x2 (system by task type) experiment, with 24 participants. Each participant completed 6 tasks in all, one using each of the 3 systems, and 2 task types. I have two performance measures: the first is completion time, and the second is a...