topic Introduction to ANOVA, Regression, and Logistic Regression - Measures of Variability in SAS Training Courses

Introduction to ANOVA, Regression, and Logistic Regression - Measures of Variability

AW75 — Thu, 08 Dec 2016 12:44:17 GMT

Hi Team,

Wondering if you could help me please

within the online course section Measures of Variability the below result is 68.87 but when I calculate i get 69.87

1 / (16-1) * [(93-78)2 + (89-78)2 + (88-78)2 + (84-78)2 + (83-78)2 + (82-78)2 + (79-78)2 + (78-78)2 + (78-78)2 + (77-78)2 + (74-78)2 + (73-78)2 + (72-78)2 + (68-78)2 + (67-78)2 + (63-78)2] = 68.87

Could you confirm which is correct and why

Thanks,

AW75

Re: Introduction to ANOVA, Regression, and Logistic Regression - Measures of Variability

Damien_Mather — Thu, 08 Dec 2016 13:26:48 GMT

Must be a typo in the course notes..

When I use trusty SAS to do the calculation I get


data x;
infile cards;
input x;
cards;
93
89
88
84
83
82
79
78
78
77
74
73
72
68
67
63
;
proc means data=WORK.X chartype var vardef=df ;
	var x;
run;

Analysis Variable : x
Variance
69.8666667

also.