Which of the following are qualities of unreliable data? select all that apply.
The preceding adage applies to machine learning. After all, your model is only as good as your data. But how do you measure your data set's quality and improve it? And how much data do you need to get useful results? The answers depend on the type of problem you’re solving. Show
The Size of a Data SetAs a rough rule of thumb, your model should train on at least an order of magnitude more examples than trainable parameters. Simple models on large data sets generally beat fancy models on small data sets. Google has had great success training simple linear regression models on large data sets. What counts as "a lot" of data? It depends on the project. Consider the relative size of these data sets: As you can see, data sets come in a variety of sizes. The Quality of a Data SetIt’s no use having a lot of data if it’s bad data; quality matters, too. But what counts as "quality"? It's a fuzzy term. Consider taking an empirical approach and picking the option that produces the best outcome. With that mindset, a quality data set is one that lets you succeed with the business problem you care about. In other words, the data is good if it accomplishes its intended task. However, while collecting data, it's helpful to have a more concrete definition of quality. Certain aspects of quality tend to correspond to better-performing models:
ReliabilityReliability refers to the degree to which you can trust your data. A model trained on a reliable data set is more likely to yield useful predictions than a model trained on unreliable data. In measuring reliability, you must determine:
What makes data unreliable? Recall from the Machine Learning Crash Course that many examples in data sets are unreliable due to one or more of the following:
Google Translate focused on reliability to pick the "best subset" of its data; that is, some data had higher quality labels than other parts. Feature RepresentationRecall from the Machine Learning Crash Course that representation is the mapping of data to useful features. You'll want to consider the following questions:
The Transform Your Data section of this course will focus on feature representation. Training versus PredictionLet's say you get great results offline. Then in your live experiment, those results don't hold up. What could be happening? This problem suggests training/serving skew—that is, different results are computed for your metrics at training time vs. serving time. Causes of skew can be subtle but have deadly effects on your results. Always consider what data is available to your model at prediction time. During training, use only the features that you'll have available in serving, and make sure your training set is representative of your serving traffic. The Golden Rule: Do unto training as you would do unto prediction. That is, the more closely your training task matches your prediction task, the better your ML system will perform.Suppose you have an online store and want to predict how much money you’ll make on a given day. Your ML goal is to predict daily revenue using the number of customers as a feature. What problem might you encounter? Click the plus icon to check your answer.The problem is that you don't know the number of customers at prediction time, before the day's sales are complete. So, this feature isn't useful, even if it's strongly predictive of your daily revenue. Relatedly, when you're training a model and get amazing evaluation metrics (like 0.99 AUC), look for these sorts of features that can bleed into your label. What are the qualities of unreliable data?Unreliable data. Nature. ... . Incorrect information. ... . Deficiencies in national statistics.. Bad loans.. Data corruption.. Collecting statistics. ... . Unreliability.. (F) Fuzzy exceptional problems.. Which of the following are qualities of a reliable data select all that apply?5 Characteristics of Data Quality. Accuracy.. Completeness.. Reliability.. Relevance.. Timeliness.. What is data unreliability?Unreliable data leads to incorrect insight and faulty predictions. Research shows that a majority of businesses make faulty predictions and suffer irreversible consequences because they depend on unreliable data. As a result, businesses suffer from missteps that can prove to be expensive in the long term.
What is data privacy applying well founded standards of right and wrong that dictate how data is collected shared and used?Data ethics refers to well- founded standards of right and wrong that dictate how data is collected, shared, and used.
|