Deutsche Bank Interview Questions, Process, and Tips

Logistic regression is preferred for interpretability and simplicity compared to random forests.

• Logistic regression is a linear model that is easier to interpret and implement compared to the complex ensemble method of random forests.

• Logistic regression is better suited for binary classification problems where the relationship between the independent variables and the outcome is linear.

• Random forests are more computati...read more

Classification models are used to predict the category or class of a new observation based on past data.

• Classification models assign new data points to a specific category or class based on patterns in the training data.

• Common classification algorithms include logistic regression, decision trees, random forests, and support vector machines.

• These models are evaluated based on metrics like accuracy, precision, recall, an...read more

Model performance can be assessed using various metrics such as accuracy, precision, recall, F1 score, ROC curve, and confusion matrix.

• Evaluate accuracy to measure overall correctness of the model's predictions.

• Use precision to assess the proportion of true positive predictions among all positive predictions.

• Consider recall to evaluate the proportion of true positive predictions among all actual positives.

• Calculate F1 ...read more

Assumptions of Linear Regression include linearity, independence, homoscedasticity, and normality.

• Linearity: The relationship between the independent and dependent variables is linear.

• Independence: The residuals are independent of each other.

• Homoscedasticity: The variance of the residuals is constant across all levels of the independent variables.

• Normality: The residuals are normally distributed.

• Example: If we are pred...read more

To stop and start JVMs in a WAS backend, use administrative console or scripting. Best practice is to perform rolling restarts.

• Use administrative console to stop and start JVMs individually or in a cluster

• Use scripting (such as wsadmin) for automation and bulk operations

• Perform rolling restarts to minimize downtime and ensure high availability

• Monitor JVM health and performance before and after restarts

Script to delete files older than 7 days in a Linux VM

• Use the find command to locate files older than 7 days

• Pipe the output of find to the rm command to delete the files

• Make sure to test the script in a safe environment before running it on important files

A mutual fund is a type of investment vehicle consisting of a pool of funds collected from many investors for the purpose of investing in securities such as stocks, bonds, money market instruments, and other assets.

• Mutual funds are managed by professional fund managers who allocate the fund's assets and attempt to produce capital gains or income for the fund's investors.

• Investors in a mutual fund own shares of the fund...read more