(B) 



EFFECT OF CONCORDANT YEAR VARIANCE 

 ON TREND DETECTION 



Mignilud** 1 povH/y«ar, a " 10. n ■ 60. s'^r^tm ■810, «^ ■ SB 



Figure 4-9. Statistical power curves for indicator. (A) Effect of annual sample size on standard 



estimate of indicator score; (B) Effect of the magnitude of coherent across-year variance 

 (indicator score units) on trend detection; (C) Capability to detect different magnitudes 

 of trend; (D) Effect of annual sample size on trend detection. 



4-36 



