Author: Venugopal Manneni

Need: An outlier is a data point in a data set that is distant from all other observations. A data point that lies outside the overall distribution of the dataset. Outliers can drastically change the results of the data analysis

Need:   Before conducting any experiment, we need to select the appropriate and optimum sample size to make sure sample should be representative of the population and the finding are generalized to the population. Also, optimum sample size required To Allow

Need:  Most of the statistical/Machine Learning techniques requires the normality assumption for significance testing as well as for modeling, but in the real time scenario most of the times the data distribution doesn’t satisfy the normality conditions. Solution Transformation is

Need:    While choosing the suitable test statistics for hypothesis testing one of the key factors is data distribution. If the data distribution is normal distribution then we will apply the parametric tests such as t, Anova, f—etc., if data is

  Need:  When you identified missing data has a pattern with other variables (Missing at Random MAR) imputing the missing values with single value (Mean/Mode) imputation does not make any sense. As missing data has some kind relation with other

  Need: Missing data is a common and exciting problem in statistical analysis and machine learning hence we need to understand the cause of the missingness (pattern) and need to impute properly otherwise the random imputation might effect the solution

Objective Propensity score methods allow investigators to estimate causal treatment effects  for observational or nonrandomized data. Need: In most of the classical experiments either in healthcare or market research studies covariates (features) are balanced through randomization so that treated and

Survival analysis is used to determine the time it takes for an event of interest to occur. We use survival analysis to study the time until some event of interest occurs. Survival Analysis is also known as Time to Event

Need: In statistical inference we have different test statistics(test) which will differ by different differs of variables as well as for different types of analysis ,hence choosing correct statistical test is really important, wrongly chosen statistical tests might not give