Clinical Informatics Certification Clinical Informatics Data Analytics 2

Question 1

Which statistical measure is most appropriate for describing the central tendency of a skewed clinical dataset such as length of hospital stay?

Accepted Answer

Median

Answer

The median is preferred for skewed distributions because it is not distorted by extreme outliers the way the mean is.

Question 2

In clinical NLP pipelines, what is the primary purpose of named entity recognition (NER)?

Accepted Answer

Identify and classify clinical concepts such as diagnoses and medications in free text

Answer

NER extracts and categorizes clinical entities like diagnoses, drugs, and procedures from unstructured text.

Question 3

A hospital wants to predict 30-day readmission risk. Which type of machine learning model outputs a probability score between 0 and 1?

Accepted Answer

Logistic regression

Answer

Logistic regression produces probability estimates between 0 and 1, making it well suited for binary classification tasks like readmission prediction.

Question 4

Which data quality dimension refers to how well data reflects the real-world construct it is intended to measure?

Accepted Answer

Validity

Answer

Validity (also called accuracy or correctness) measures whether recorded values truly represent the underlying clinical reality.

Question 5

When building a predictive model with highly imbalanced classes (e.g., 1% positive cases), which evaluation metric is most informative?

Accepted Answer

Area under the ROC curve (AUROC)

Answer

AUROC evaluates model discrimination across all classification thresholds and is robust to class imbalance, unlike overall accuracy.

Clinical Informatics Certification Practice Test

Clinical Informatics Certification Practice Test

Clinical Informatics Certification Clinical Informatics Data Analytics 2