i'm going to start an test approximately drying leaves. I need to study how a few special kind of leaves are going to dry themselves in 2 distinctive scenario. a group of them will stay in a high density, and the some other institution i can spread out in a larger region (as an instance, 1 m2 for the primary, and 3 m2 for the second). Of route, i can repeat this experiment numerous times. in the end, i will get: Individual weight of the leaves (selecting samples) in the beginning Individual weight along 4 days Individual weight in the end Nutritional composition in the start and in the end I am remembering my knowledge in stats and R, but I am still lost. My question is, which is the best comparison method to analyse this data? I want to know: How the humidity content change along the days

Uroskopieulm 2022-11-19 Answered
i'm going to start an test approximately drying leaves. I need to study how a few special kind of leaves are going to dry themselves in 2 distinctive scenario. a group of them will stay in a high density, and the some other institution i can spread out in a larger region (as an instance, 1 m2 for the primary, and 3 m2 for the second). Of route, i can repeat this experiment numerous times. in the end, i will get:
Individual weight of the leaves (selecting samples) in the beginning
Individual weight along 4 days
Individual weight in the end
Nutritional composition in the start and in the end
I am remembering my knowledge in stats and R, but I am still lost. My question is, which is the best comparison method to analyse this data? I want to know:
How the humidity content change along the days
To dry this kind of leaves, which drying area is better?
Is it statistical significance between both method about losing water and nutrient content?
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Answers (1)

Aliya Moore
Answered 2022-11-20 Author has 17 answers
It is possible you are trying to cram too much into one design. Here is a somewhat simplified version:
Consider three effects:
Density (fixed effect δ at two levels High and Low)
Leaves (random effect L at n levels)
Times [fixed effect τ, three levels (0, 4, Last), nested within Leaves].
These specifications to the model
Y i j k = μ + δ i + L j + τ ( L ) k ( j ) + { δ L } i j + e i j k ,
where e i j k i i d N o r m ( 0 , σ ) .. Lower-case Greek letters represent fixed effects, upper-case Latin letters respresent random effects, parentheses indicate nesting; Y i j k are measurements of weight and e i j k are normally distributed random effects. [Parentheses are read as 'of ' not 'within'.]
The only interaction effect supported is between Density and Leaf, a three-way interaction for density, Leaf and time would be confounded with the error term, and there cannot be an interaction between an effect τ and an effect L within which it is nested.
[Many software packages have proprietary notations for indicating fixed and nested effects; for example Minitab declares random effects separately and indicates nesting within the model by parentheses.]
You might do separate ANOVAs for humidity and nutritional content. Alternatively, do a multivariate ANOVA [MANOVA] with weight, humidity, and nutritional content as data dimensions.
This type of design is sometimes called 'partially hierarchical' and sometimes called 'repeated measures'. But the terminology 'repeated measures' has been used in so many different ways in different fields of study as to have become almost useless.
Whatever model you use, you must account for the fact that the same leaves are measured at three times, but that the leaves at High density are not the same as those at Low density.
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