s*******i
发帖数: 295 | 1 I have two statistic questions. Any help will be truly truly truly
appreciated. My stat is so poor....
1. In an experiment two levels of water stress (or dryness) are randomly
assigned to containers holding four plants of a specific genotype. A control
is included. In this setting, the control is the usual water or moisture
condition required for the plant to grow normally. Ten genotypes are
investigated in this study. The plant height is measured for each plant.
a. Overview this experiment, par |
D******n
发帖数: 2836 | 2 quite normal stat questions, if u know stat u will know the answer, if u don
t know stat why were u asked these questions?
btw, statistics not statistic
control
for
【在 s*******i 的大作中提到】
: I have two statistic questions. Any help will be truly truly truly
: appreciated. My stat is so poor....
: 1. In an experiment two levels of water stress (or dryness) are randomly
: assigned to containers holding four plants of a specific genotype. A control
: is included. In this setting, the control is the usual water or moisture
: condition required for the plant to grow normally. Ten genotypes are
: investigated in this study. The plant height is measured for each plant.
: a. Overview this experiment, par
|
b*********e
发帖数: 29 | 3 Do you mean that you have 10 genotypes, for each genotype, you have a
control and two treatments (water level)? |
s*******i
发帖数: 295 | 4
don
To me not normal. If I know I will not post the questions. Thanks for your
kindly response.
【在 D******n 的大作中提到】
: quite normal stat questions, if u know stat u will know the answer, if u don
: t know stat why were u asked these questions?
: btw, statistics not statistic
:
: control
: for
|
s*******i
发帖数: 295 | 5
See, that is the key point. I think it is a 2*10+1 control factorial design.
But not quite sure about the answer.
【在 b*********e 的大作中提到】
: Do you mean that you have 10 genotypes, for each genotype, you have a
: control and two treatments (water level)?
|
D******n
发帖数: 2836 | 6 3X10....
design.
【在 s*******i 的大作中提到】
:
: See, that is the key point. I think it is a 2*10+1 control factorial design.
: But not quite sure about the answer.
|
D*******a
发帖数: 207 | 7 好像是有10种genotype，每种有4N+1棵植物，其中一个是control，然后有N个
container，每个container里面有4棵植物。不知道理解得对不对。 |
b*********e
发帖数: 29 | 8 What is the reseracher's interests? How did they do the experiments? Do they
want the genotypes as blocks? What do the researchers really want to know? |
s*******i
发帖数: 295 | 9
So, for question2, how do you suggest to design the 3**(3-1) fractional
factorial?
【在 D******n 的大作中提到】
: 3X10....
:
: design.
|
s*******i
发帖数: 295 | 10
they
My understanding is treatment level has 2 and 1 control. There are totally
10 genotypes with 4 replicates each. The research's interesting according to
my understanding is how the water stress and genotype affect the plant
height.
【在 b*********e 的大作中提到】
: What is the reseracher's interests? How did they do the experiments? Do they
: want the genotypes as blocks? What do the researchers really want to know?
|
b*********e
发帖数: 29 | 11 Tf they want to know how the water stress and genotype affect the plant
height, this could be a completely random design with 30 treatment.But, this
does not make sense to me.
Most likely, the height is the response and the water stress be the variable
and the genotype could be the block.
Not very sure, depends on the researcher's interest.
The second question is very interesting and I am waitint for the answer too. |
s*******i
发帖数: 295 | 12
this
variable
too.
Well, in the question "Ten genotypes are investigated in this study", so isn
't it a variable? I agree height is response. Question also asks about
whether genotype is fix or random. If it is block, should be random. But in
this way, the rest question "is it important? and Describe scenarios for
both cases" will not work.....
【在 b*********e 的大作中提到】
: Tf they want to know how the water stress and genotype affect the plant
: height, this could be a completely random design with 30 treatment.But, this
: does not make sense to me.
: Most likely, the height is the response and the water stress be the variable
: and the genotype could be the block.
: Not very sure, depends on the researcher's interest.
: The second question is very interesting and I am waitint for the answer too.
|
s*******i
发帖数: 295 | 13
this
variable
too.
The second question, I am thinking to choose A1B1C1 as the defining contrast
for no reason coz I do not know why as well....In this way, there might be
a lost for the effect....
【在 b*********e 的大作中提到】
: Tf they want to know how the water stress and genotype affect the plant
: height, this could be a completely random design with 30 treatment.But, this
: does not make sense to me.
: Most likely, the height is the response and the water stress be the variable
: and the genotype could be the block.
: Not very sure, depends on the researcher's interest.
: The second question is very interesting and I am waitint for the answer too.
|
