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Histograms & Summary DataPowerPoint Presentation

Histograms & Summary Data

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Histograms & Summary Data. Histograms & Summary Data. Summarizing large of amounts of data in two ways: Histograms: graphs give a pictorial representation of the data Numerical summaries: gives snapshot of the data overall: “Average”, “Mode”, “Median”, etc. Histograms & Summary Data.

Histograms & Summary Data

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Histograms & Summary Data

- Summarizing large of amounts of data in two ways:
- Histograms: graphs give a pictorial representation of the data
- Numerical summaries: gives snapshot of the data overall:
- “Average”, “Mode”, “Median”, etc

- Microsoft Excel has several tools that allows to summarize data:
- sorting
- Maximum
- Minimum
- range (difference between max and min)
- mean (average)
- grouping data
- plotting a histogram

- Sorting in Excel

Click on “Data”

Click on “Sort”

- Sorting in Excel

Store the data to be sorted in a list by columns

Click to sort the column from low to high and vice versa

Click “OK”

- Sorting in Excel
- Ex: On the class webpage, go to the file NBAPlayerHeights.xls
- File contains data for the top ten player heights (in inches) by team during the 1990-91 season

- Use the Sort tool in Excel to list all the player heights from smallest to largest

First, highlight the data you wish to sort

Go to “Data” and click “Sort”

Click “Ascending”, then click “OK”

- What is the smallest height?
- Answer: 67 inches

- What is the largest height?
- Answer: 91 inches

- MIN and MAX functions find the minimum value(s) and maximum value(s) in a list
- The range is the maximum minus the minimum
- AVERAGE function finds the average or mean
- SUM function adds numbers in a list

- Excel also has a Histogram tool
- This function separates data into bins
- The function counts how much data lies within each bin
- You can (and should) define the size of the bin prior to opening the function

- A histogram organizes data into groups by counting how much data is in each group
- The groups are sometimes called “bins”
- The number of observations in each “bin” is called the frequency

- Installing the Histogram feature:

Click on “Tools” and then on “Add-Ins”

- Installing the Histogram feature:

Click on these boxes

Hit “OK” to install. It will take a few moments for these packs to install

- Creating a Histogram

Click on “Tools”

Click “Data Analysis”

- Creating a Histogram

Click on “Histogram”

Click “OK”

- Creating a Histogram:

Cells where your data is stored goes here

Your Bin Limits or Bin Widths go here. You need to type these beforehand in your worksheet

Choose the cell you want the frequencies of your bins to be displayed in Excel

- Using NBAPlayerHeights.xls, create a histogram with bin widths of 5 starting at 65 inches

- Create Bin Limits in Excel

Create a cell called “Bins”

Enter your Bins. Since we want bin to be width 5 there is only a difference of 5 between consecutive cells.

Cell Range of Data Goes Here

- Create Histogram

Bin range you created goes here

The cell where you want the frequencies to be displayed

- And the Results . . .

This is the number of uncounted player heights that were less than or equal to 70 inches

- Make a column called “Labels”
- This will used to label your x-axis

- Plotting Our Results:
- Click on Chart Wizard

- Select Chart Type

Click “Column”

- Plotting

Choose “Columns”

Cell Range of your Histograms Frequencies goes here

Click “Next”

- Plotting:

Click on “Series” tab from previous slide

Use #’s in “Labels” column

Click on “Next”

Give an informative title that clearly describes the graph

Clearly label each axis. Don’t forget units!

Click “Finish”

- And the results:

- One last thing . . .
- Left-click on one of the bars:

- Then Right-click on one of the selected bars
- You’ll get this menu:

Click here

Change this to zero

Click this tab

- And now the final results (really!)