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Horizontal bar below the distribution box

In a horizontal box plot, the horizontal bar below the box represents the minimum value or the lower whisker, showing the lowest data point within the non-outlier range.

Understanding the Horizontal Bar

In a horizontal box plot (also called a box-and-whisker plot), the main components include: Box: Represents the interquartile range (IQR), covering the middle 50% of the data between the first quartile (Q1) and third quartile (Q3). Median Line: A line inside the box indicating the median (Q2) of the dataset. Whiskers: Lines extending from the box to the minimum and maximum values within 1.

5 times the IQR. The horizontal bar below the box is the lower whisker, showing the smallest value that is not considered an outlier. Outliers: Points beyond the whiskers, plotted individually to highlight extreme values.

Purpose of the Horizontal BarThe horizontal bar below the box provides a visual cue for the spread of the lower portion of the data. It helps identify: The range of the lower 25% of the data. Potential skewness: If the lower whisker is much longer than the upper whisker, the distribution is right-skewed; if shorter, it is left-skewed.

Comparison across groups: When multiple horizontal box plots are aligned, the lower whiskers allow quick visual comparison of minimum values. Creating a Horizontal Box Plot in ExcelTo create a horizontal box plot in Excel: Prepare your dataset and calculate the five-number summary: minimum, Q1, median, Q3, and maximum. Insert a stacked bar chart and switch rows/columns to orient it horizontally.

Format the bars to represent the box and whiskers, using error bars to create the horizontal whiskers, including the lower whisker below the box. Remove fills for clarity and adjust outlines to highlight the box and whiskers. The horizontal bar below the box is essential for interpreting the full distribution, especially the lower range, and complements the median and upper whisker to provide a complete picture of data variability.

Horizontal bar below the distribution box

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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