Calculate Quandt's breakpoint statistic (lambda)                 (STB-17: sts7)
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	^quandt^ varlist ^if^ ^in^ [ ^, g^enerate(varname) ]

calculates Quandt's breakpoint statistic, called lambda.  The observation 
at which lambda is at a minimum is considered a likely breakpoint.  ^quandt^ 
returns the observation number of the minimum value of lambda in S_1 and 
the value of lambda at that observation in S_2.


Options
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^g^enerate(varname) specifies a new variable in which to store the series
  of lambdas.


Author
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	Sean Becketti, Stata Technical Bulletin
	FAX 913-888-6708

References
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Quandt, Richard E. (1958).  "The estimation of the parameters of a linear 
  regression system obeying two separate regimes," ^Journal of the American^
  ^Statistical Association^.  Volume 53, pp. 873-880.

Quandt, Richard E. (1960).  "Tests of the hypothesis that a linear regression
  system obeys two separate regimes," ^Journal of the American Statistical^
  ^Association^.  Volume 55, pp. 324-330.


Also see
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    STB:  sts7 (STB-17)
On-line:  ^help^ for ^ts^

