Antes de calcular alguno de los tres parámetros debe indicar el tipo de Data del que dispone:

Parameter to calculate :	Prevalence Incidence rate Disease Duration
Prevalence :	expressed as percentage (%) expressed as proportion [0-1]
Incidence rate :	expressed as individuals-day expressed as individuals-week expressed as individuals-month expressed as individuals-year
Disease Duration :	expressed in days expressed in weeks expressed in months expressed in years

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