Research methodology and biostatistics, Line diagrams

This is a PPT on diagrammatic presentation of data using line diagrams.

1. Line diagram Dr. S. sarathi , DEPT. OF KUZHANTHAI MARUTHUVAM

2. LINE GRAPH Line graph is a diagram that shows a line joining several points or line that shows the relationship between the points. The graph represents quantitative data between two changing variables with a line or curve that joins a series of successive data points. Linear graphs compare two variables in a vertical axis and a horizontal axis. What is a line graph used for? Generally, line graphs or line charts are used to track variations over time, which may be long-term or short-term. We can also use line graphs to compare changes over the same period for more than one group . A line graph helps understand the performance or comparisons over time by observing the line’s steepness on a graph sheet.

3. Various parts of the line diagram TITLE → It explains what the graph is about. SCALE → Numbers that show the units used on the graph. LABEL → Both the side and bottom of the line graph have a label that tells what kind of data is shown. X-axis describe what each data point on the line represents and Y-axis shows the numeric value for each point on the line. LINE → Connect all the data points. POINT → Represent the data amount.

4. Types of Line Graphs Simple Line Graph:  Only one line is plotted on the graph. Multiple Line Graph:  More than one line is plotted on the same set of axes. A multiple line graph can effectively compare similar items over the same period of time. Compound Line Graph:  If information can be subdivided into two or more types of data. This type of line graph is called a compound line graph. Lines are drawn to show the component part of a total. The top line shows the total and line below shows part of the total. The distance between every two lines shows the size of each part.

5. SIMPLE LINE GRAPH

6. DOUBLE LINE GRAPH It shows two line graphs within one chart. Compares two different subjects over a period of time. It shows how things change over a period of time. Used to compare trends and patterns between two subjects.

7. Compound Line Graph

8. How TO make a line graph? Step 1 : Observe the data from the data-table to choose a suitable scale . Step 2: Draw and label the scale on x and y axes, i.e. the horizontal and vertical axes, respectively. Step 3: List each item and place the points (taking x-value as the x-coordinate and y-value as the y-coordinate) on the graph. Step 4: Finally , join the plotted points with line segments to get a line chart.

9. THANK YOU