quadratic

  1. E

    Linear modelling

    Hi, I need some help with a modeling query: I have fit 100,000 linear models: M ~ age + age^2, M is the frequency. I found 2,000 models were significant, but would like to narrow it down to find the most ‘extreme’ cases. Is this possible? Does anyone have any suggestions or any references...
  2. S

    Hypothesis:

    If you wanted your null hypothesis to be that y and x are linearly related, and your alternative to be that they are quadratic. What could you use as your null and alternative hypothesis, and how would you go about testing it?
  3. T

    Hierarchical regression in SPSS (how to enter interactions when you have a quadratic)

    Hello there! I want to confirm if I am entering my variables in the proper way in SPSS for multiple regression. I have four variables: 1) student gender (dummy); 2) student gender proportionality (continuous); 3) faculty gender (dummy); and 4) student gender proportionality SQUARED...
  4. A

    Modelling this non-linear relationship- please help

    Hi All, I'm using usual Cox regression where my outcome is time to a binary event. My variable of interest (a biological marker) appears to show a non-linear relationship with the outcome. I categorised it as 10 quantiles with the 6th as the reference category. The HR (with 95% CI) for...
  5. D

    Minitab Quadratic Regression Model- Specifying the y-Intercept

    Hello, I am using Minitab v16.1.1 to perform a general regression analysis, and I was wondering, is it possible to customize a quadratic regression model to have a specific non-zero value? I would like to set my model's y-intercept to 1. Originally I was fitting a model to my data in...
  6. H

    what test to use tell significant difference of two quadratic regression curves

    Hello I have two curves of quadratic regression models in a x-y plot 1. y=a1x^2+b1x+c1 Y= -0.51X2-0.88X+3.21, R2: 0.12, coefficient of the quadratic term: p-value = 0.001 y=a2x^2+b2x+c2 Y= -0.17X2-0.13X+3.41, R2: 0.99, coefficient of the quadratic term: p-value = 0.001 I want to know if...