Random and Systematica error
Every dataset is distinct, data cames from distinct sources and services, but all data sources have errors and we need to know what this ones suppose to our analysis and statistical models.
Random Error
Random error can be explained as the error that is generated in the process of adquiring the data, as an example, if you weight yourself 10 times in a row you will observe some variation in the results.
There’re some requirements to an error to be random, let’s explain them:
- The sum of all the error scores tends to cancel over number ob mesurements.
- It’s unrelated to the true score.
- The error component of one measurement is unrelated to the error component of any other measurement.
For instance, in a series of measurements, a pattern of the size of the error component should not be increasing over time, so later measurements have larger errors, or errors in a consistent direction, relative to earlier measurements.
Systematic Error
In contrast, systematic error has an observed pattern that can be measured, and the cause of this pattern can be analized and solved.
An example of systematic error can be measures coming from a not balanced temperature sensor, always have 5 degrees more than the real value.
Previos post about Data Types here:
Next post about Basic Probability here:
This is the second post of my particular #100daysofML, i will be publishing the advances of this challenge at github, twitter and Medium (Adrià Serra).
