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uncertain_options.go
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/
uncertain_options.go
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package uncertainty
type OptionType int
const (
sampleSizeOpt OptionType = iota
zScoreOpt
percentErrorOpt
)
type Option struct {
optionType OptionType
intVal int
floatVal float64
}
func SampleSize(n int) Option {
return Option{
optionType: sampleSizeOpt,
intVal: n,
}
}
func getSampleSize(opts []Option, def int) int {
for _, v := range opts {
if v.optionType == sampleSizeOpt {
return v.intVal
}
}
return def
}
const zScore95 = 1.96
func ZScore95() Option {
return ZScore(zScore95)
}
const zScore99 = 2.58
func ZScore99() Option {
return ZScore(zScore99)
}
const zScore90 = 1.64
func ZScore90() Option {
return ZScore(zScore90)
}
func ZScore(score float64) Option {
return Option{
optionType: zScoreOpt,
floatVal: score,
}
}
func getZScore(opts []Option, def float64) float64 {
for _, v := range opts {
if v.optionType == zScoreOpt {
return v.floatVal
}
}
return def
}
func PercentError(v float64) Option {
return Option{
optionType: percentErrorOpt,
floatVal: v,
}
}
func getPercentError(opts []Option, def float64) float64 {
for _, v := range opts {
if v.optionType == percentErrorOpt {
return v.floatVal
}
}
return def
}