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A method of controlling for multiple extraneous effects by including all possible combinations within each treatment condition / arm of an experiment.

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22 views

Unmatched groups in Repeated Measures

I have a dataset of participants who learned two lists (X and Y) in a within-subject design. Their memory was measured at the end of the experiment. There were equal number of participants assigned to ...
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0answers
64 views

Is this a factorial design or latin square?

I've designed the following experimental design for testing three interfaces with users. The users are randomly distributed to the subject groups, then asked to complete three different tasks, with ...
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0answers
118 views

Change scores in regression

In my design, I have two within-subject conditions (Intervention versus Placebo, each participant undergo the two condition, while the order of conditions was counterbalanced between subjects). I ...
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0answers
228 views

Categorical within-subjects design: what test do I use?

I conducted a within-subjects psychological study, whereby 30 subjects were tested on all 3 conditions. Responses were recorded in in a yes/no fashion: a control condition, which everybody did first, ...
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1answer
88 views

Within-Subjects or Between-Subjects MANOVA

I am designing an experiment to test drone pilot reaction time to obstacles introduced to the drone's flight path in a controlled setting. There is one IV with 3 levels, and 3 DV. IV is visual ...
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1answer
2k views

Repeated Measures Design but also testing order effects in SPSS

I am a psychology student using SPSS to analyse my data. I have 2 conditions of the IV of treatment (treatment or no treatment) to test pain tolerance levels which is measured by the DV of pulse rate ...
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votes
1answer
2k views

Advantages of counterbalancing vs. randomizing stimuli

I'm designing an experiment, in which 40 participants answer 10 questions, 5 in condition $A$ and 5 in condition $B$, and I'm interested in the difference between the two conditions. It's not clear ...
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0answers
637 views

Calculate 'order effect'

My experiment has the following setup: Participant completes exercise A. Participant completes exercise B. A counterbalancing design was used to remove (reduce?) the effect of order on the results; ...
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0answers
38 views

some suggestions for analyzing two-factor within subject design?

I'm doing a two-factor within-subject design experiment, and the two factors are all categorical variables. factor one has four categories, while factor two has two categories, and is counterbalanced. ...
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0answers
490 views

Repeated Measures ANOVA pairing counterbalance issue

I have been conducting all of my analyses on one DV (Quality) using a repeated measures ANOVA, with two variable (Time and Gender) at two levels each. However, it occurred to me today, that this might ...
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2answers
903 views

Balancing gender in an experiment

Say a study aims to see if two variables A and B are correlated in the general population. It isn't clear to me how extraneous variables like gender should be treated when the sample is selected. Each ...
2
votes
1answer
121 views

2 x 2 mixed anova?

96 participants were randomly assigned to one of the two groups regardless of their motivation level. Participants in both the groups were exposed to both the experimental conditions of gain framed ...
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2answers
35 views

Do I need to counterbalance 8 audio excerpts to control for order effects?

I have 8, 1-minute audio excerpts, all that feature the same music. Four of them were recorded by a middle school music ensemble (2 expressive, 2 unexpressive) and four by a high school music ...
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0answers
342 views

Asymmetrical Order Effects in Within Subject Design

I am currently running a study with two groups (controll and current psy. disorder). All participants have three conversations, are videotaped and watch the videos of their interactions afterwards, ...
2
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1answer
259 views

Simple experimental design - should I counterbalance?

I'm designing a pretty simple experiment that goes like this. Participants will be shown a series of stimuli and after viewing each one they will answer a few questions where they will make judgments ...
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2answers
382 views

When does counterbalancing task participation order take care of practice effects?

I'm thinking of a study in which participants are randomly assigned to do task A then task B, or vice-versa. I figured there will be a problem if doing Task A is really good practice for Task B, but ...
4
votes
1answer
1k views

Can there be endogeneity?

I am performing a regression in which I suspect there could be endogeneity between the main explanatory variable and the dependent. As a first step I perform an OLS regression and then, to control for ...
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1answer
551 views

When can I leave counterbalancing factors (between participants) in an ANOVA out of a write up?

The following is a problem that I keep encountering in different forms. For now, I give one example, but I would also be interested in the answers to the more general question. I have a design with a ...
2
votes
1answer
277 views

Would a split-plot ANOVA be appropriate to look for order effects in my data?

I have a study in which 60 subjects took both drug A on one day and drug B on another. The order of drug administration was counterbalanced, such that 30 subjects took drug A on the first day and 30 ...
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0answers
78 views

Analysing a balanced mixed models design?

I am designing an experiment and I'm in need of some help. Participants are presented with two videos on a website. In one period, a feature (a table of contents for the video) is enabled, while in ...
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0answers
54 views

How to compare first to second half of measurements in a counterbalanced behavioral experiment?

I want to compare measurements in two halves of a behavioral experiment to examine for learning effects. My first course of action is to split the measurements in the two halves and then repeat the ...