How to calculate regression of a logistic curve

Thread starter brandy
Start date Aug 10, 2009
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Curve Regression

In summary, a logistic curve is a mathematical function used to model growth or decay in a population over time. It is calculated through regression analysis using statistical software or a calculator. The curve is different from linear regression as it is used for binary outcomes and assumes a non-linear relationship between variables. The logistic curve has various real-world applications but also has limitations, such as assuming a non-linear relationship and independent data points.

Aug 10, 2009

brandy

i have some data and want to find a logistic cruve regression line
is there are formula i can apply to find the regression line from the data?

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Aug 10, 2009

EnumaElish

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See http://en.wikipedia.org/wiki/Logistic_regression

1. What is a logistic curve?

A logistic curve is a type of mathematical function that is used to model growth or decay in a population over time. It is characterized by an initial rapid increase, followed by a gradual leveling off as the population approaches its maximum capacity.

2. How do you calculate the regression of a logistic curve?

To calculate the regression of a logistic curve, you will need to use a statistical software or a calculator that has a logistic regression function. The process involves inputting your data points, specifying the logistic function to be used, and running the regression analysis to determine the best-fit curve that describes your data.

3. What is the difference between linear and logistic regression?

Linear regression is a statistical method used to model the relationship between a dependent variable and one or more independent variables. It assumes a linear relationship between the variables, meaning that the change in the dependent variable is directly proportional to the change in the independent variable(s). On the other hand, logistic regression is used to model binary outcomes (e.g. yes or no), and it assumes a non-linear relationship between the variables.

4. How is the logistic curve used in real-world applications?

The logistic curve has many real-world applications, including in biology, ecology, epidemiology, economics, and social sciences. It is commonly used to model population growth, predict the spread of diseases, forecast sales or market trends, and analyze consumer behavior.

5. What are the limitations of using a logistic curve?

While the logistic curve is a useful tool for modeling certain types of data, it also has its limitations. For example, it assumes that the relationship between the variables is non-linear and that the data points are independent. Additionally, the curve may not accurately fit data that exhibits extreme fluctuations or has outliers. It is important to carefully consider these limitations when using a logistic curve in your analysis.