can i use splines to plot cubic swath age and birth date in sas can you plot more than one spline and age age vs birth date when to correct age and birth date age and birthdate on splines age and birth date plot in sas how to calculate age of child in a sas t scale are the birth date and age fixed what is the age limit on excel splines age and birth date is fixed age and birth date fixed effects if age and birth date are fixed on splines why age and birth date are fixed effects age vs. birth date on splines are birth dates and age a fixed effect age and birth date on splines age and birth date are fixed effects are age and birth date fixed age is fixed in sas