All Questions
Tagged with random-allocation blocking
11 questions
5
votes
1
answer
177
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How should I analyse this experiment with two blocking factors
In this experiment, a machine is used to compare the wear resistance of 4 different types of rubber-coated fabric (variable mat coded A, B, C and D). To do this, ...
- 323
3
votes
1
answer
393
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What is a Randomized Complete Block Design. How do we create one and analyze it?
I have been reading about experimental design, and Randomized Complete Block designs (RCBD) in particular and I have a few queries. What exactly is a randomized complete block design ? Is there a ...
- 323
1
vote
1
answer
132
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Understanding the advantages of CRD experiments
I am self studying an introductory course on Designed Experiments and have come across the notion of a Completely Randomised Design (CRD) defined as follows:
Completely Randomised Design: the ...
- 243
0
votes
1
answer
74
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Balanced incomplete block design - randomizing treatment order
In a balanced incomplete block (BIB) design, what is the best way to ensure each treatment appears in all positions/orders? Should I randomize treatment order within each block, so that participants ...
- 1
2
votes
1
answer
272
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Why is it acceptable to use the Sum of Squares of an Interaction as the Sum of Squares Error in a Randomized Complete Block Design?
Take for example the RCB design [Y = I + B + F + E], where...
Y is the response
I is the overall intercept
B is a blocking factor with two levels
F is a treatment factor with two levels
E represents ...
- 403
3
votes
2
answers
399
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Block design or completely randomized?
I have 5 conditions in my experiment: A,B,C,D,E and my sample size is 200 subjects.
I want to have 40 subjects per condition, so I assign a condition to a person randomly without replacement.
E.g. ...
- 415
5
votes
1
answer
188
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Experimental Design Problem with Goofy Constraints
I am having trouble designing an experiment. I will give a hypothetical example that shares the main features of my actual problem.
Suppose there are:
$M$ meadows, indexed by $m={1,...,M}$, where $M \...
- 38.3k
2
votes
2
answers
264
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Best way to do block randomisation with covariates?
I have a set of $n$ objects for an experiment and I want to randomise them into a control group and treatment group with fixed sizes. I would like to use block randomisation to balance covariates, in ...
- 133k
1
vote
0
answers
146
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Comparing Power of SRS to Block Randomization
I am trying to figure out how to run/analyze a block randomized experiment in the following situation, and to figure out how much of an improvement I would get over simple random sampling:
Suppose I ...
- 11
2
votes
1
answer
153
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Blocking effect in Experiment
Let $T\in\{0,1\}$ be the variable representing the treatment. Let $X\in\{0,1\}$ be the variable representing the attributes of subject. For example, $T$ is a new medicine that will make people grow ...
- 6,919
3
votes
0
answers
976
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Non-Randomized Block Design?
Suppose I am running a $2^2$ factorial design in two blocks. Denote the factors as A and B and the four treatment combinations as $(1), a, b$ and $ab$. Consider the blocking arrangement:
...
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