15. Quiz: Assess (Visual)

Assess: Visual

Assess: Visual

Quiz

Data Quality

Refer to the image above and check the boxes below that seem like data quality issues that we'll need to consider when cleaning.

SOLUTION:
  • NaN (NaN stands for not a number and often represent missing values)
  • Multiple ways of referring to "As soon as possible" in the StartDate column

Solution

Assess: Solution

More Visual Assessment

Feel free to visually assess the dataset some more using the Jupyter Notebook below.

Note: Any issues that you detect and document will not appear in future notebooks in this lesson.

Workspace

This section contains either a workspace (it can be a Jupyter Notebook workspace or an online code editor work space, etc.) and it cannot be automatically downloaded to be generated here. Please access the classroom with your account and manually download the workspace to your local machine. Note that for some courses, Udacity upload the workspace files onto https://github.com/udacity , so you may be able to download them there.

Workspace Information:

  • Default file path:
  • Workspace type: jupyter
  • Opened files (when workspace is loaded): n/a

Tip: It is best if you document all your assessments at the very bottom of the Assess section in the data wrangling template, i.e., directly above the Clean heading. Referring to them when defining cleaning operations is easier this way and prevents hectic scrolling.

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