What is the difference between treatment and control?
Two groups were monitored longitudinally over a long period of time, one received treatment (Treatment), the other received nothing (Control). At the end of this period of time experimental values for each group were obtained.
What is the best way to compare outcome measures between three groups?
If you have three groups, and are interested only in the outcome measure values for the two monitored groups (control, single treatment) vs. the baseline measure values for the baseline group, then an ordinary one-way anova would permit this comparison (with the proviso that the usual assumptions were satisfied).
How do you statistically compare growth curves?
you fit a simple exponential model like y = exp(b*x) with a different "b" for each medium. This coefficient refers to the growth rate, so you would actually compare the growth rates obtained in the different media.
How do you compare growth over time?
The formula used for the average growth rate over time method is to divide the present value by the past value, multiply to the 1/N power and then subtract one. "N" in this formula represents the number of years.
What is growth curve in psychology?
1. a graphic representation of the growth rate of an organism. 2. a graphic representation of the progressive increase in learning of an individual or group.
What is growth curve analysis?
Growth curve analysis is a data reduction technique: it is used to summarize longitudinal data into a smooth curve defined by relatively few parameters for descriptive purposes or further inquiry.
How do you compare two growth rates?
Next to compare the difference in growth between two measurements of the same type over the same period of time:First complete the growth rate percentage for each point over the timespan.Next subtract the difference between the two calculations,Lastly depending on how you want to display the data:
How do you compare the growth rate between two functions?
Step 1: Given the functions f(x) and g(x) , compute the limit limx→∞f(x)g(x) lim x → ∞ f ( x ) g ( x ) . Step 2: If the limit in Step 1 is a finite constant a≠0 a ≠ 0 , then the growth rate of f(x) is a times the growth rate of g(x) at sufficiently large x .
What are the two types of growth curves?
There are two types of growth curves: the j shaped growth curve and the s-shaped growth curve. Both the types of growth curves fit population growth models that have different environmental pressures.
When do you use the growth curve model?
As Patrick describes in the first of a series of videos, growth curve models can be useful whenever there is a focus on the analysis of change over time, such as when examining developmental changes, evaluating treatment effects, or analyzing diary data.
What are the types of growth curve?
The two types of growth curves that are most common are logarithmic growth curves and exponential growth curves.
How do you study the growth curve of bacteria?
Traditionally, the growth curve measurements are performed by measuring the OD of the bacteria, which is related to the cell number, in cuvettes at the wavelength of 600 nm using photometry at desired time points with intervals of 30–60 min [3, 4].
How do you develop the growth curve of bacteria?
Pick up a single colony of each strain from the agar plate and inoculate it into a test tube containing 10 ml of autoclaved broth....Day 3:Take 250 ml of autoclaved broth in a sterile 500 ml conical flask.Inoculate 5 ml of the overnight grown culture in above flask.Take OD at zero hour.More items...•
What is growth curve in microbiology?
growth curve, in biology, a curve in graph form that shows the change in the number of cells (or single-celled organisms) in an experimental culture at different times.
Most recent answer
Thank you all greatly for your detailed responses. I truly appreciate the help, we have determined that due to the nature of the study that simple two-way ANOVA is most appropriate.
All Answers (9)
You might consider MANOVA for the multiple dependent variables in your treatment versus control groups, or if you have enough observations within each group, you could consider growth curve modeling.
Similar questions and discussions
What statistical test should I use if I have control and experimental groups to show pre to post treatment significant changes?
The Challenges of Each Growth Curve
Neither type of growth is good nor bad. These growth patterns are simply the way certain things work. However, it is important to understand the growth pattern of your task so that you can set your expectations appropriately.
How to Accelerate Your Progress
Once you understand the type of growth curve you are dealing with, there are two ways that you can accelerate your progress on a given curve.
The Bottom Line
Most things in life have some type of growth curve and very rarely is that curve a straight line.
Phases of the Bacterial Growth Cycle
The bacterial growth curve represents the number of living cells in a population over time. Michal Komorniczak/Wikimedia Commons/CC BY-SA 3.0
Bacterial Growth and Oxygen
Campylobacter jejuni, shown here, is a microaerophilic organism requiring reduced levels of oxygen. C. jejuni is the bacterium which causes gastroenteritis. Henrik Sorensen/The Image Bank/Getty Images
Bacterial Growth and pH
Helicobacter pylori are microaerophilic bacteria found in the stomach. They are neutrophiles that secrete an enzyme that neutralizes stomach acid. Science Picture Co/Getty Images
Bacterial Growth and Temperature
New Zealand's Champagne Pool is a hot spring that contains a community of thermophilic and acidophilic microorganisms whose distribution relates to the temperature and chemical environment. Simon Hardenne/Biosphoto/Getty Images
Bacterial Growth and Light
Cyanobacteria (blue) are photosynthesizing bacteria that are found in most habitats where water is present. Several spores (pink) are also seen. Steve Gschmeissner/Science Photo Library/Getty Images
