| pthreshold | R Documentation | 
Probability a true score will be below a threshold
pthreshold(x, threshold, rxx, mu = 0, sigma = 1)
x | 
 observed score  | 
threshold | 
 threshold  | 
rxx | 
 reliability coefficient  | 
mu | 
 population mean  | 
sigma | 
 population standard deviation  | 
probability
pthreshold(x = .5, threshold = 1, rxx = 0.9)
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