# Questions tagged [experiment-design]

The study of how to structure an information-gathering exercise where variation is present.

1,419 questions
Filter by
Sorted by
Tagged with
9k views

### Calculate number of needed simulations

First I have to apologize for any uncorrect naming or categorisation of my question, as I am an electrical engineer rather than a mathematican. I have a simulation that outputs for a given number of ...
901 views

### Participant identifier for a field study in a sensitive work environment

We are doing an evaluation in different organizations and need to get data from workers about their work behavior. As this information is something that could get workers in trouble, privacy is an ...
1k views

### How many degrees of freedom with many subjects and many tests?

Lets say I run an experiment testing accuracy of hitting targets of two different sizes. I have 10 participants and 40 targets, 15 small and 25 large. I then have the number of misses for each target ...
473 views

### Experimental design: what to do when factors cannot be held at constant levels?

I am looking at some data with a 5 factors and a response variable. The experiment was designed as a factorial experiment, with observations at different levels of each factor. One thing that I have ...
1k views

### 2x2x2 plus control group: nested ANOVA?

I recently ran an experiment assessing the impact of three system factors (factor A; factor B; factor C) on user attitudes (4-item scale). Each system factor had two levels (high vs. low). As a result,...
209 views

### What statistical test should be used to accomplish the objectives of the experiment

I'd like to have your feedback to analyze my data from the following experiment. Experiment Information A total of 30 (15 from one city and other 15 from another city) slaughtered animals were ...
3k views

### Categorical dependent variable in between subject design

My colleague has an experiment with a 2x2 all between subjects design with categorical variables predicting a three-level categorical dependent variable (choise between A, B, C/ coded as -1 0 1). Is ...
157 views

### Weighting a control group

In reviewing some market research, I came across a study which decided to weight the results/outcomes of the control group so the distribution of participants in the control sub-groups (0,1,2,3,4,5 - ...
632 views

200 views

### How to predict how much data to collect?

I'm currently in the planning stages of an experiment that I hope will detect a 0.155% signal variation (relative magnitude) within a reasonable time frame (less than 6 months ideally). I've ...
184 views

### Is this a repeated measures experiment?

We conducted an experiment on hens with seven treatments (medicines) replicated three times. Every treatment was implemented on a flock of fifteen young hens and three of these treated hens were ...
574 views

### What is the proper ratio of mean squares for a two-level nested ANOVA?

I would like to analyse the following type of experiment using a two-level fully nested ANOVA. We have mice of two genotypes (Group factor) and for each of the genotypes we take a certain number of ...
499 views

### Which statistical test should I use for my experiment on aggressive interactions in killifish?

I am doing a project on sexual selection (male-male competition) in the turquoise killifish Nothobranchius furzeri. There are two morphs of male in the population from which my fish are obtained ...
1k views

### How to describe a design with a mix of experimental conditions, predictor variables, and multiple outcome variables?

My research design is as follows: I have these Between Subjects IVs: Experiment Condition - 5 levels Facebook User status - 2 levels (yes/no) My supervisor also wants me to see if there are ...
1k views

### Individuals standard deviations and/or standard errors for groups after implementing ANOVA?

I've seen couple of articles reporting individuals standard deviations and/or standard errors for groups even after implementing ANOVA. My understanding is that groups SE's should be based on ...
183 views

### Optimal blind poll construction

This is a question strongly related to Cauchy "characters". I'm constructing a 4 question canvassing questionnaire that will tell the likely voter being contacted which of the presidential candidates ...
358 views

### Number of times to run a lengthy experiment

I have this long running experiment. Each time I run it I get a new goodness value, since the algorithm has random variables in it. So I need to report the mean and the std of some n runs. What should ...