Prediction interval for one score

Source: R/statpsych1.R

Computes a prediction interval for the response variable score of one randomly selected member from the study population.

pi.score(alpha, m, sd, n)

Arguments

alpha

alpha level for 1-alpha confidence

m

estimated mean

sd

estimated standard deviation

n

sample size

Value

Returns a 1-row matrix. The columns are:

  • Predicted - predicted score

  • df - degrees of freedom

  • LL - lower limit of the prediction interval

  • UL - upper limit of the prediction interval

Examples

pi.score(.05, 24.5, 3.65, 40)
#>  Predicted df       LL       UL
#>       24.5 39 17.02546 31.97454

# Should return:
# Predicted  df       LL       UL
#      24.5  39 17.02546 31.97454