2_Unit1.2_Measurement copy

5 025 025 3 05 variable error std dev std dev x m2 n

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Unformatted text preview: ∑ (x-m)2 n-1 Trial 1 4 Trial 2 2 3 Trial 3 5 1 Trial 4 Trial 5 1.5 0.25 0.25 3 0.5 Variable Error (Std Dev) Std Dev = ∑ (x-m)2 n-1 (x – m) (x – m)2 -0.85 0.7225 0.25 -0.85 0.7225 3 1.9 3.61 5 Sum 0.5 5.5 -0.6 Mean 1.1 Trials Error 1 1.5 2 0.25 3 4 0.16 5.5 0.36 5.5775 7 Variable Error (Std Dev) ∑ (x-m)2 Std Dev = n-1 (x – m)2 Trials Error (x – m) 1 1.5 0.4 0.16 2 0.25 -0.85 0.7225 3 0.25 -0.85 0.7225 4 3 1.9 3.61 5 Sum 0.5 5.5 -0.6 Mean 1.1 5.5 0.36 5.5775 means??????---it means on avergae we were 1.1 awayf rom the center of the target Variable Error (Std Dev) ∑ (x-m)2 Std Dev = Trials n-1 Error 1 1.5 2 0.25 3 4 (x – m) (x – m)2 0.4 0.16 -0.85 0.7225 0.25 -0.85 0.7225 3 1.9 3.61 5 Sum Mean 0.5 5.5 1.1 -0.6 Std Dev the 1.181 is another circle around the point at 1.1 that is 1.181 around the mea 1.181 5.5 0.36 5.5775 its not clear…..it can be either way… Skilled Performance?? (A) (B) Which would be regarded as most skilled? (A) has a lower AE & lower CE, but a higher VE than (B). (B) has a higher AE & higher CE, but a lower VE than (A) 8 its not clear….. Continuous Skills Root mean square error (RMSE) •  Error between a participant’s displacement (position) curve and a criterion (ideal) curve this is for continuous motion and will not be asked of you on the exam!!!!!!!!! •  Computes one error score for the total duration of the task summary slide!!!! Performance Outcome Measures Magnitude Accuracy Time/speed Dichotomy hit/miss Zones of accuracy Absolute error (AE) Radial Error (RE) Constant error (CE) Variable error (VE) RMSE critical slide!!!!!!!!!!!!!!! very important measure!!!!!!!!!!!!! Speed: Reaction and Movement Time •  Reaction time (RT): interval between the onset of a signal or stimulus, to the initiation of a response Stimulus or ‘Go’ signal Light/Color Vision Word/Sound Hearing Shock/Vibration reaction time is from when you first initiate it. Touch vibration is the fastest reaction and light is the slowest. 9 3 diff types Reaction Time Choice RT Simple RT Discrimination RT Stimulus Used in information processing studies Response key Index Middle Ring Index simple--one stimulus and one response choice--not only are you reacting to the stimules but you ahve to make anothe decision like matching a color to the color you saw. decrimination--now you have a single response and you only respond when you see the blue light!!… dont respond when the other lights go on. Index descrimination---like the police training method where you have to not shoot the civilians and shoot the bad guys.. like COD training. Reaction Time Match the following Simple RT Choice RT Discrimination RT multisensory fusion---when you react faster to multipple stimuli faster than either alone What are typical RT values? Simple RT: Light Siren Electrical shock All together 240 ms 220 ms 210 ms 180 ms real life is always multisensory fusion Swink (1966) Choice RT: # of choices 1 2 3 4 5 6 7 8 9 10 ~RT (ms) 200 350 400 450 500 550 600 600 650 650 choices decrease reaction time. Damon e...
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This document was uploaded on 03/28/2014 for the course KNES 385 at Maryland.

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