PPT Slide

Weibull Distribution(continued)

• In order to compute cumulative unit sales:Y1, Y2, Y3, , , unit sales from t=0 to t=0.5, S1, unit sales from t=0.5 to t=1.5, S2, unit sales from t=1.5 to t=2.5, S3, , , are summed up accordingly and respectively.

• Let t be an error, then our model becomes as follow: Yt=m Ft(t )+ t , where, t~N (0, 2) is assumed.

• PROC NLIN of SAS is used for the parameter estimation.

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