- distribute and explain
- what they need to do in lab
- what they need to turn in
Qualitative and Temporal Analysis sections
Discuss what should go in Qualitative and Temporal Analysis sections - refer to the Project Requirements document for specifics. However, the following points should be emphasized:
- motion description in Qualitative section
- time-related variables only in Temporal section
Making angle-angle graphs
Demonstrate how to make an angle-angle graph:
- make sure they know how to make scales the same on horizontal and vertical axes. For axes to have the same scale, both the data range (max-min) and physical length (on screen) of x and y axes must be exactly the same.
- axes should be the same scale on both a and b parts of the figure
- show how to resize physical length of axes so the graph is "square"
Hints for making angle-angle graphs:
- INSERT a new worksheet
- COPY "angle" column of data from fig 4a (joint angle 1)
- PASTE SPECIAL (select VALUES) to the new worksheet
- COPY "angle" column of data from fig 5a (joint angle 2)
- PASTE SPECIAL (select VALUES) to the right of the previously copied data
- label each column according to the variable (e.g., knee and angle)
- HIGHLIGHT both columns of data (the data in the left-hand column will be plotted on the x axis)
- SELECT chart wizard from the toolbar
- CHOOSE X-Y scatter plot
- CHOOSE #2
- NO legend, NO title, X-LABEL "joint 1" Angle (deg), Y-LABEL "joint 2" Angle (deg)
- NO border, NO Shading in chart area
- RESIZE (2 inches tall by 2.75 inches wide)
- MATCH AXES lengths
- FIND start point and ADD arrow to show direction of movement.
- REPEAT the same steps for btrim data
Interpreting angle-angle graphs
Go through several angle-angle diagrams using projects on the web - at this point you should review the "Qualitative Dynamics of Disordered Locomotion" paper handed out at this semester's first 402 meeting. Pages 376 and 377 provide two tables which will be helpful when interpreting each project's angle-angle graphs (fig7a and fig7b).
- interpretation of diagonals, horizontals, and verticals
- alike or different?
Interpreting angle-angle graphs:
- find starting point of your movement
- figure out flexion and extension directions
- decide whether your data is coupled, decoupled, sequential, or not related
Facilitators should look at angle-angle diagrams during lab:
- check axis scaling
- check arrows
- check caption
Make backup copies at end of lab
- make sure each team backs up their work:
- copy contents of most up-to-date ZIP disk to each member's disk
- emphasize importance of making backups each time they work
- remind them of the "click of death"
Melissa Gross , Ph.D. - mgross@umich.edu
The University of Michigan, Division of Kinesiology
Revised 9/99
©1996 Melissa Gross, Ph.D.
