What's a histogram? Why is it indispensable in the analysis?
Histogram is a statistical chart that shows the frequency distribution of the continuous variable. It divides the data range into several continuous, equidistance ranges (known as “groups” or “bins”) and uses rectangular heights to indicate the amount of data that falls within the range. Histograms are the first step in exploratory data analysis (EDAs) that provide a visual picture of whether the data are distributed in a normal way, whether there is a eccentric or multi-peaker.
Distinction between histogram and barchart
Although it looks similar, the histogram is used for display Continuous variable The distribution (e.g. height, temperature, time) of the rectangle is usually not separated to indicate continuity; And bar charts are used for comparison Disconnected category(e.g. city, brand, gender).
How do you interpret the histogram?
- Centre Location: The highest rectangular regions represent a trend towards data concentration.
- Disconnection: The extent of the transaxis reflects the range of fluctuations in data.
- Distribution Shape: Symmetric bells usually mean normal distribution; The one-sided lengthening of the “tail” indicates that the data are biased.
Privacy and calculation
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