# Blog

Biostatistics

### What is the normal distribution?

The normal distribution or Gauß distribution is called normal, as it is seen as the ideal case of a distribution. It is showing the distribution

Biostatistics

### What is the correlation coefficient?

The correlation coefficient (r) is a specific measure that quantifies the strength of a linear statistical relationship between two variables, as well as its direction.

Biostatistics

### What are cross tables, odds ratio and the relative risk?

Cross tables are also known as contingency or multidimensional tables. Large amounts of data can be summarized in a structured way and possible relationships between

Biostatistics

### Graphical presentation of data

In clinical studies usually a large number of data is generated. The challenging part is then to present the data in a structured and condensed

### What is the difference between absolute, relative, and cumulative frequencies of occurrence?

Descriptive statistics present a good first overview of the data. The frequency of occurrence, as part of descriptive statistics, provides information that is easy to

### What is the scatter, dispersion and shape of a distribution?

When presenting the data descriptively, the distribution of single variables can include the following parameters: Scatter parameters such as the mean, median, and mode; dispersion

Biostatistics

### Exploratory and Confirmatory Analyses

Clinical trials often aim to establish two key parameters about a novel treatment or device: They should show that the product is safe and efficacious.

### What are descriptive statistics?

Descriptive statistics summarize a sample, for example the group of patients included in a clinical trial. They have to be distinguished from inductive and explorative

Biostatistics

### What is a parameter or variable?

What do statisticians mean when they talk about parameters or variables? In the frame of a clinical study, a variable is something that can be

Biostatistics

### Biostatistician

It is a widely spread view that biostatisticians should be involved only after data has been collected. But involving a biostatistician already in the planning