Cyber Crime cases where they talk about or its two types of error
This task is completed by Sandeep Kumar Patel
The confusion matrices discussed above have only two conditions: positive and negative. In some fields, confusion matrices can have more categories. For example, the table below summarises communication of a whistled language between two speakers, zero values omitted for clarity
n the field of machine learning and specifically the problem of statistical classification, a confusion matrix, also known as an error matrix,is a specific table layout that allows visualization of the performance of an algorithm, typically a supervised learning one (in unsupervised learning it is usually called a matching matrix). Each row of the matrix represents the instances in an actual class while each column represents the instances in a predicted class, or vice versa – both variants are found in the literature. The name stems from the fact that it makes it easy to see whether the system is confusing two classes (i.e. commonly mislabeling one as another).
It is a special kind of contingency table, with two dimensions ("actual" and "predicted"), and identical sets of "classes" in both dimensions (each combination of dimension and class is a variable in the contingency table).
What is Confusion Matrix and why you need it?
Well, it is a performance measurement for machine learning classification problem where output can be two or more classes. It is a table with 4 different combinations of predicted and actual values. It is extremely useful for measuring Recall, Precision, Specificity, Accuracy and most importantly AUC-ROC Curve.
Interpretation: You predicted positive and it’s true. You predicted that a woman is pregnant and she actually is.
Interpretation: You predicted negative and it’s true. You predicted that a man is not pregnant and he actually is not.
False Positive: (Type 1 Error)
Interpretation: You predicted positive and it’s false. You predicted that a man is pregnant but he actually is not.
False Negative: (Type 2 Error)
Interpretation: You predicted negative and it’s false. You predicted that a woman is not pregnant but she actually is. Just Remember, We describe predicted values as Positive and Negative and actual values as True and False.
How many values did we predict correctly? How many true predictions out of all samples there are?
A confusion matrix is a summary
A confusion matrix is a summary of prediction results on a classification problem. The number of correct and incorrect predictions are summarized with count values and broken down by each class. This is the key to the confusion matrix. The confusion matrix shows the ways in which your classification model is confused when it makes predictions. It gives you insight not only into the errors being made by your classifier but more importantly the types of errors that are being made. It is this breakdown that overcomes the limitation of using classification accuracy alone.