Collaborative Filtering

The recommendation system is prove to be very helpful in increasing revenue for big platforms like Netflix, YouTube, Amazon, Flipkart etc. Users are also introduced with items they like and they don't have to rigorously search for it. There is one method for recommendation system called Collaborative Filtering. It's of two types :- User-based collaborative … Continue reading Collaborative Filtering →

Covariance And Correlation

Covariance It gives relation between two features or two random variables. It tells how one depends upon other. It could be positive or negative. Simple way to find covariance is to multiple variance of both the variables. Let's discuss this with an example then it will be more clear. Let a = [1,2,3,4,5,6,7,8,9] and b … Continue reading Covariance And Correlation →

Percentile and Moments

Percentile It gives the level of an element in data. Lets discuss with an example :- 1,2,3,4,5,6,7,8,9 ,10 we have this data in increasing order. To find Kth percentile :- Step 1 : Arrange the elements in ascending order Step 2 : multiple K percent with number of elements Step 3 : Let result be … Continue reading Percentile and Moments →

Variance and Standard Deviation

Let's discuss variance and standard deviation. Variance It is average of squared differences from the mean. In simple words we subtract mean from every element and which give us the distance of every element from mean. Then we square each to avoid negative numbers and then find average. For example :- 1,2,3,4,5,6,7,8,9 Mean = 5 … Continue reading Variance and Standard Deviation →

Mean, Median and Mode

Let's get into little elementary stuff which is basic but important. Mean It is the average of all entries or data points. For example :- 9,2,3,1,2,2,4,1,5,6,3 Mean = (9+2+3+1+2+2+4+1+5+6+3)/11 = 3.455 Median It is the mid point of the data. For example :- considering previous data i.e 9,2,3,1,2,2,4,1,5,6,3 Median = sort the data then pick … Continue reading Mean, Median and Mode →

Types of Data

As rightly said data is the new fuel. So let's talk about types of data. There are basically three types of data :- Numerical CategoricalOrdinal Numerical In this type of data we have numerical values. It is of two types :- DiscreteContinuous Discrete Here we have discrete or exact values. For example :- 2,45,23 or … Continue reading Types of Data →