Top 25 Data Science Interview Questions and Answers

1) How would you create a taxonomy to identify key customer trends in unstructured data?
The best way to approach this question is to mention that it is good to check with the business owner and understand their objectives before categorizing the data. Having done this, it is always good to follow an iterative approach by pulling new data samples and improving the model accordingly by validating it for accuracy by soliciting feedback from the stakeholders of the business. This helps ensure that your model is producing actionable results and improving over the time.
2) Python or R – Which one would you prefer for text analytics?
The best possible answer for this would be Python because it has Pandas library that provides easy to use data structures and high performance data analysis tools.
3) Which technique is used to predict categorical responses?
Classification technique is used widely in mining for classifying data sets.
4) What is logistic regression? Or State an example when you have used logistic regression recently.
Logistic Regression often referred as logit model is a technique to predict the binary outcome from a linear combination of predictor variables. For example, if you want to predict whether a particular political leader will win the election or not. In this case, the outcome of prediction is binary i.e. 0 or 1 (Win/Lose). The predictor variables here would be the amount of money spent for election campaigning of a particular candidate, the amount of time spent in campaigning, etc.
5) What are Recommender Systems?
A subclass of information filtering systems that are meant to predict the preferences or ratings that a user would give to a product. Recommender systems are widely used in movies, news, research articles, products, social tags, music, etc.

Comments

Post a Comment

Popular posts from this blog

AWS Interview Questions and Answers

Image
1.What kind of network performance parameters can you expect when you launch instances in cluster placement group? The network performance depends on the instance type and network performance specification, if launched in a placement group you can expect up to 10 Gbps in a single-flow, 20 Gbps in multiflow i.e full duplex Network traffic outside the placement group will be limited to 5 Gbps(full duplex). 2.To deploy a 4 node cluster of Hadoop in  AWS  which instance type can be used? First let’s understand what actually happens in a Hadoop cluster, the Hadoop cluster follows a master slave concept. The master machine processes all the data, slave machines store the data and act as data nodes. Since all the storage happens at the slave, a higher capacity hard disk would be recommended and since master does all the processing, a higher RAM and a much better CPU is required. Therefore, you can select the configuration of your machine depending on your workload. For e.g...
Read more

C Interview Questions

WHAT ARE DIFFERENT TECHNIQUES FOR MAKING HASH FUNCTION? Techniques for making hash function. •  Truncation Method This is the simplest method for computing address from a key.In this method we take only a part of the key as address. •  Midsquare Method In this method the key is squared and some digits from the middle of this square are taken as address. •  Folding Method In this technique, the key is divided into different part where the length of each part is same as that of the required address, except possibly the last part. •  Division Method (Modulo-Division) In Modulo-Division method the key is divided by the table size and the remainder is taken as the address of the hash table. –>Let the table size is n then H (k) =k mod n Master C and Data Structure, in  this C and Data Structure  certification training. WHAT ARE THE ISSUES THAT HAMPER THE EFFICIENCY IN SORTING A FILE? The issues are: Length of time required by the programmer i...
Read more

How AWS Training Is Helpful for Companies

Image
AWS stands for Amazon Web Services which is a subscription service that offers quite a number of services to its users, helping them scale and grow their businesses as they see fit. Services available from AWS range from  servers  to  storage  to devices you can use to  test your applications . The list of services offered by AWS is growing daily, allowing enterprises, start-ups, and even public sector customers to access theright combination of a-la-carte tools to react quickly to changing business requirements. You can review the entire  list of services  offered with AWS, but be warned: it is  growing quickly. myTectra AWS training  is a comprehensive hands on solutions-based training program which needs to be known by the participant who are interested for developing their skills in cloud computing. Participant are able to receive a high quality AWS training experience from the industry experts at myTectra. >>Read more...
Read more