Please help me with that why the model in c is a reduced mod

Q. 5 The genotype of an individual at a given position in the genome (called a locus) can be coded as a categorical variable with three levels usuly labelled AA, Aa and aa. A study was conducted looking at how the genotype at one specific locus affects systolic blood pressure. Here is the output from PROC GLM The GLM Procedure Dependent Variable: sb Sum of Source Model Error Corrected Total DF 4 25 29 Squares Mean Sqre F Value Pr> F 8.31 0.0002 613.679849 461.786818 1075.466667 153.419962 18.471473 Source gender age gene Type III SS 269.2466292 169.8072899 167.3908980 Mean Squar Value 269.2466292 169.8072899 DF Pr>F 14.58 0.0008 9.19 0.0056 4.53 0.0209 83.6954490 https://www.coursehero.com/file 7410508/S3A03exam2011/ Continued on Page 4

Solution

In (a) we are testing the model as sbp = gender age gene/ solution.

Where gene includes all three types of genes.

Since in the (c )model we test only for AA therefore we have a reduced model.