2. Lucas (1957) presented data from an extra-period crossover study on dairy cows. Three diet treatments were

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2. Lucas (1957) presented data from an extra-period crossover study on dairy cows. Three diet treatments were being compared and the response was the average daily production of FCM. The data is shown in the table below.

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(a) Does every treatment follow every other treatment, including itself?

(b) Analyze the data using proc glm. Are the treatment and carryover ef-
fects orthogonal? Check by comparing their type I and type III sums of squares.

(c) Use the lsmeans statement to get least squares adjusted means for treat-
ments. Why is this possible when it was not possible for the example in Section 9.4.1 ?

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