1 / 7

Error Measures

Error Measures. Emily Wughalter, Ed.D . Error Measures. Error measures help provide detail about performance when meeting an object in space. They help to quantify performance. As in swinging a bat and meeting a ball in space with the end of a bat

ena
Download Presentation

Error Measures

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Error Measures Emily Wughalter, Ed.D.

  2. Error Measures • Error measures help provide detail about performance when meeting an object in space. They help to quantify performance. • As in swinging a bat and meeting a ball in space with the end of a bat • As in wanting to click on an icon by moving cursor on the screen • As in grabbing a stick of deodorant from the medicine cabinet • As in hitting a golf ball off a T, or in hitting the golf ball so that it is precisely directed in its flight and for its landing location • As in driving a car and being able to drive in a lane with acceptable variability

  3. Measuring Error • Error measures are determined to explain various phenomena and by applying varying algorithms. They can be used to explain performance for a series of trials (trial blocks) with regard to matching a moving or stationary object in space. • Consider validity • Consider ecological validity • Consider reliability • Consider objectivity • Consider assumptions • Consider practical value and need

  4. Error Measures in Motor Learning • Constant error • Variable error • Absolute error

  5. Constant Error (CE) • CE provides information about a performer’s response bias • Does the performer generally respond early (undershoot) or late (overshoot) with respect to the target or matching location of a movement? • Does the performer have a general tendency? • CE is determined by adding up the algebraic error scores and dividing by the number of scores or calculating the mean. • CE should be presented with VE to more fully understand its meaning.

  6. Variable Error (VE) • VE helps to explain the variability (changes) in performance across a series of trials between a position in space and the matching of that position. • Calculate VE as the standard deviation of a set of scores (trial block)

  7. Absolute Error • AE measures the average difference or average total error between the target location and the matching performance across a series of trials. • Calculate absolute error by obtaining the mean of the absolute value of the algebraic error scores for a series of trials.

More Related