This paper discussed about the construction of a model the relationship between a dependent variabel and a independent variabel using spline analysis regression. This methods is usually used when the relationship between variables is unknown. This methods is applied to construct the growth curve for children under 3 years of age in Padang.Kata Kunci: spline regression, growth curve, children under 3 years of age
                        
                        
                        
                        
                            
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