Data Cleaning 5

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1. Histogram vs. Bar chart

   With bar charts, each column represents a group defined by a categorical variable; and with histograms, each column represents a group defined by a quantitative variable.Which means we can change the order of categories in bar chart. But we can not swap the quantitative variable in histogram.

2.We can use map() combined with dictionary/Series to convert our target data to the data we want to.

  series = ["Yes", "No", NaN, "Yes"] #Origonal data set

  yes_no = {"Yes": True,"No": False} # The dictionary we would like to convert all the Yes to True, and all the No to False

  series = series.map(yes_no) # use the map function

3.

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