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Questions tagged [experimental-design]

Experimental design is the methodological study of how experiments should be designed to maximize the scientist's ability to make inferences about the causal effect of an independent variable on a dependent variable.

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Hardware Synchronization for Scientific Experiment

I am new to python as well as scientific experimental setups. My experimental setup includes that subjects would be shown some visual stimuli which is programmed in Python. While subjects are looking at those visual stimuli their eyes' data would be…
Muaz
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Determine sample size for A/B testing, more than 2 variants

What R function should we use if we want to decide the sample size for such a test: 10 ads, we want to use a test to decide which ads has the best click through rate. We are able to count the flow and click throughs.
StayLearning
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Database design for keeping track of experiment data

I am designing a database to record experiment results. Basically, an experiment has several input parameters and an output response. Therefore, the data table will look like following: run_id parameter_1 parameter_2 ... parameter_n response 1 …
Poplong
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Experiment design for count data

I got trouble on a work problem, which I need to design an experiment that can compare different treatment means. I'm gonna use one way anova with 6 levels which are tel_check, applicant_check, and several other checks. I want to find all this…
Zhang Moyi
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Combine different kind of items according to a previous rating

I am building an experiment with the psychopy builder and I want to do an "evaluative conditioning" experiment. That is: first, different stimuli are rated according to their valence. Later, neutral stimuli will be paired with negative or positive…
Sarah
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Randomly Assign Integers in R within groups without replacement

I am running an experiment with two experiments: experiment_1 and experiment_2. Each experiment has 5 different treatments (i.e. 1, 2, 3, 4, 5). We are trying to randomly assign the treatments within groups. We would like to do this via sampling…
Thomas
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Closed system shellcode experimentation (segfault)

I am taking an online software security course. I am attempting to experiment with shellcode. I have written a vulnerable server, an injection program, a (probably broken) shellcode I convert to assembly, that I then strip with a python script. I…
motoku
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Selecting only a small amount of trials in a possibly huge condition file in a pseudo-randomized way

I am using the PsychoPy Builder and have used the code only rudimentary. Now I'm having a problem for which I think coding is inevitable, but I have no idea how to do it and so far, I didn't find helpful answers in the net. I have an experiment…
Sarah
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Repeating trials in MatLab

i'm am very new to Matlab but really want improve. For my experiment i want to show a picture which the participant response yes/no to, using two different keys (f&g) and then the next picture is presented and it repeats so onward. Presenting the…
M Druyvesteyn
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Custom jQuery "slime" menu, strange functionality

I want to create a jQuery slime menu. The basic concept is simple. I have some icons with fixed positions on the screen. Some of them are "switches", and if you click them, you need to click on another element to have some effect (imageine something…
Balázs Varga
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How to reproduce experiments in a non-adhoc manner

For a master thesis in the field of distributed computing (think of hadoop and two-level schedulers like Mesos) I'm setting up various experiments on a university cluster. However I'm already piling up bash scripts which function as a driver for the…
hbogert
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Balanced incomplete block design with Loop and if statement

I have a code that i use to generate balanced incomplete block design in R. We have value of trt as 14 and k as 4 which are fixed. However we change value of b in the find.bib() function to generate a design and check if that design is balanced…
StatguyUser
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find the most effective treatment in a Latin square with R

I have a latin square with various treatments A, B, C, D. I want to know the most effective, ie the treatment that takes a larger…
user_012314112
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Find the linear model of a latin square design

I want to get the equation of the linear model for the following experiment mat in latin square. data <- c(12.5,11,13,11.4) row <- factor(rep(1:2,2)) col <- factor(rep(1:2,each=2)) car <- c("B","A","A","B") mat <- data.frame(row,col,car,data) mat #…
user_012314112
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Main Effect plot with ggplot2

I am new to R and ggplot2. I would like to create a main effect plot for a full-factorial experiment I did. The plot should take the mean of the low level and plot a line to the mean of the high level. As of now I was able to create the means with…
kaos
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