hmmat {DBfit}

R Documentation

K-Phase Design Matrix

Description

Returns the design matrix for a general k-phase intervention model

Usage

hmmat(vecss, k)

Arguments

vecss	a vector of length k with each element being the number of observations in each phase
k	number of phases

Details

It returns a matrix of 2*k columns. The design can be unbalanced, i.e. each phase has different observations.

References

Huitema, B. E., Mckean, J. W., & Mcknight, S. (1999). Autocorrelation effects on least- squares intervention analysis of short time series. Educational and Psychological Measurement, 59 (5), 767-786.

See Also

hmdesign2

Examples

# a three-phase design matrix
hmmat(c(10,10,10),3)

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