Should I use multiple replicates in my screening design?
Screening designs to reduce a large set of factors usually don't use multiple replicates. If you are trying to create a prediction model, multiple replicates can increase the precision of your model. If you have more data, you might be able to detect smaller effects or have greater power to detect an effect of fixed size.
What is a replicate in research?
Replicates are multiple experimental runs with the same factor settings (levels). Replicates are subject to the same sources of variability, independently of each other. You can replicate combinations of factor levels, groups of factor level combinations, or entire designs.
How many runs does it take to replicate an entire design?
You can replicate combinations of factor levels, groups of factor level combinations, or entire designs. For example, if you have three factors with two levels each and you test all combinations of factor levels (full factorial design), one replicate of the entire design would have 8 runs (2 3 ).
What are the advantages of using multiple replicates?
If you are trying to create a prediction model, multiple replicates can increase the precision of your model. If you have more data, you might be able to detect smaller effects or have greater power to detect an effect of fixed size. Your resources can dictate the number of replicates you can run.
Which statement is the best explanation for seasonality on Mars?
Which statement is the best explanation for seasonality on Mars? The tilt of Mars's axis causes annual variation in the amount of solar radiation received by the northern and southern hemispheres of the planet.
Which principle is best supported by the results of Sutherland's studies in which fish predators were excluded from a marine fouling community?
Which principle is best supported by the results of Sutherland's studies in which fish predators were excluded from a marine fouling community? Communities can follow different successional paths and display alternative states.
Why do small islands have higher extinction rates?
When an island is nearly empty, the extinction rate is necessarily low because few species are available to become extinct. And since the resources of an island are limited, as the number of resident species increases, the smaller and more prone to extinction their individual populations are likely to become.
Which statement is closest to Alfred Russel Wallace's early hypothesis for the higher diversity of life in the tropics?
Which statement is closest to Alfred Russel Wallace's early hypothesis for the higher diversity of life in the tropics? The tropics are more climatically stable than other parts of the globe, and thus tropical species have had more time to diversify than those in areas with severe climatic conditions.
What is replicates in science?
Replicates involves running the same study on different subjects but identical conditions. For example, if a I wanna know the effect of three differente temperatures on seaweed growth and I repeat ALL the experiment two more times, i have 3 replicates)
What is biological replicate?
Biological replicates are parallel measurements of biologically distinct samples that capture random biological variation, which may itself be a subject of study or a noise source. (For example, the number of animals in a experiment).
How many independent experiments are there in a seedling experiment?
in this kind of experiment they consider each seedling is a biological replicate and following five independent experiments
What is an experimental unit?
An experimental unit is one particular element from the subject population under study. Each experimental unit will receive a certain treatment (specific combination of levels of each factor), and its response will be measured.
Why are the six seeds inside each dish considered observations?
The six seeds inside each dish are "observations", because you cannot treat each of them independently of the other five. Your "n" is the number of experimental units = dishes. From a statistical point of view, having 1, 6 or 100 seeds inside dishes is strictly the same, each one is n=1.
Can you randomize an experiment?
Treatments can be directly applied (like a dose of insecticide to an insect) or they can be observational (sex, weather, disease). If you randomize, you typically randomize the experimental units. Note that there are some additional terms: subsample, techincal replicate, pseudoreplicate.
Is biological replicate the same as repetition?
In my opinion, repetition and biological replicate (as i stated before) are similar. I think in most papers authors use replicates but they do not say if they really do the same experiment several times, and, instead, they are doing repetitions. Most of the time, doing replicates are more expensive.