Principal Component Analysis Advantages
Principal Component Analysis Advantages, with the help of Principal Component Analysis (PCA), a statistical technique, we are able to reduce the number of features in our data from a large number to just a few.
However, there are advantages and disadvantages to this method. You will discover the benefits and drawbacks of the PCA method in this tutorial.
Advantages of the PCA
When trying to extract the key characteristics from a large data collection, performing a PCA can be a very smart idea.
A few benefits of PCA are as follows:
The drawbacks of a high-dimensional data set can be overcome via PCA.
Overfitting, which occurs when there are too many variables in the data set, is one of the key problems when studying a high-dimensional data set. Such an overfit can be avoided by reducing the dimensionality of the data set using PCA.
The PCA’s major characteristic is that it enables us to condense a sizable data set. If we need to run an algorithm on our data or visualize it, this can be quite helpful. Otherwise, it would be incredibly challenging to see all of our features clearly.
The correlation of our features would need to be found manually, which is frequently nearly difficult, and would require a significant amount of time and effort.
We obtain principle components that are independent of one another when applying PCA to our data set.
Machine learning algorithms will converge more quickly when we use the primary components of the data set rather than all the variables. The training time of the algorithms will shorten with fewer features.
Increases visual clarity
It can be challenging to comprehend and display a high-dimensional data set. We can much better visualize our high-dimensional data by converting it to a low-dimensional data set with the use of PCA.
Disadvantages of PCA
In our investigation, the Principal Component Analysis approach can also have certain drawbacks:
Data normalization is necessary before running PCA.
The PCA technique pinpoints the directions where the data variation is greatest. All variables should have a mean of 0 and a standard deviation of 1 before computing the main components because a variable’s variance is calculated on its own squared scale. Otherwise, the PCA would be dominated by the variables whose scale is larger.
We might lose some important data.
If we don’t choose the appropriate number of principal components for our data set and its variance, using the principal component analysis could result in some information loss.
Some key elements might be challenging to comprehend.
The original features of our data set will be converted into principal components, which are linear combinations of the original characteristics, when we apply principal component analysis to our data set.
But which elements, variables, or traits in the data collection are the most important? Following the PCA, it may be challenging to provide an answer to this question.