Datacollection-and-Pre-processing

1.Data Standardization

What is standardization In statistics and machine learning, data standardization is a process of converting data to z-score values based on the mean and standard deviation of the data.

The resulting standardized value shows the number of standard deviations the raw value is away from the mean.

Basically each value of a given feature of a dataset will be converted to a representative number of standard deviations that it’s away from the mean of the feature.

This will allow us to compare multiple features together and get more relevant information since now all the data will be on the same scale.

The standardized data will have mean equal to 0 and the values will generally range between -3 and +3 (since 99.9% of the data is within 3 standard deviations from the mean assuming your data follows a normal distribution).

Let’s take a look at the z-score formula:

2.In the Handling of dataset

We have two types of method.

1. Imputation
2. Dropping

Imputation

In the imputation method we control the data and also we assume data here we have three types of method.

1. Mean
2. Mode
3. Median

Dropping

This method we used for large no. of dataset let we have 20000 line of data and we find in 10000 line having NaN Values so we drop the all NaN values.

3.Label Encoding

Breast Cnacer Data Labeling

In this we have two types of dependecies of daignosics

B- Benign(early stage) it is converting as 0 because in alphabet B is frist

M- Malignan(last stage) it is converting as 1 because in alphabet M is second

In the Label encoding we have some data in (variable LabelEncoder) we have converted as target variable and all are changes into 0 and 1

Iris Data Labeling

In this we have three types of dependecies of Species

Iris-setosa- it is converting as 0 because in alphabet setosa is frist

Iris-versicolor- it is converting as 2 because in alphabet versicolor is second

Iris-virginica- it is converting as 3 because in alphabet virginica is third

In the Label encoding we have some data in (variable LabelEncoder) we have converted as target variable and all are changes into 0, 1 and 2

4.Train and Testing the data by sklearn

We have have some data of diabetic person so we analysis the data by traing and testing the data by import some Scikit learn libraries, We importing sklearn.preprocessing ,StandardScaler,Svm,And Most Important for learnig the data BY train_test_split. In this data we let some ext variable like X and Y or standardized this data. I also used data standardization process

5.Handling Imbalanced Dataset

In this I basically import the numpy and pandas libraries and upload a credit_card_data this data having very large no. of deatails (9965, 31) in form of column and row in this data has no null values so we took a Class name of row in this Class row a data is data is giving in form of 0 and 1 here --

0 -> Legit Transactions

1 -> Froud Transactions

but this is highly imbalanced only 38 froud transactons are in so i Building a sample dataset similar distribution of legit and froud tarnsanctions and also concat both legit and froud transactions

Axis = 0 Mean

It mean our legit up and froud on down of the legit transaction and another mean our data also shown in row form.