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    -------- regression diagnostic functions --------

    arch            : computes a test for ARCH(p)
    arch_d          : demo of arch() test for ARCH(p)
    bkw             : computes and prints BKW collinearity diagnostics
    bkw_d           : demo of bkw()
    bpagan          : Breusch-Pagan heteroscedasticity test
    bpagan_d        : An example of  bpagan(),
    cusums          : computes cusum-squares test
    cusums_d        : demo of rec_resid()
    dfbeta          : computes BKW (influential observation diagnostics)
    dfbeta_d        : demo of dfbeta(), plt_dfb()
    diagnose        : computes regression diagnostic measures (see RETURNS)
    diagnose_d      : demo of diagnose()
    plt_cus         : plots cusum squared tests
    plt_dfb         : plots BKW influential observation diagnostics
    plt_dff         : plots BKW influential observation diagnostics
    qstat2          : computes the Ljung-Box Q test for AR(p)
    qstat2_d        : demo of qstat2() Ljunbg-Box Q test
    rdiag           : residual analysis plots
    rdiag_d         : demo of rdiagn()
    recresid        : compute recursive residuals
    recresid_d      : demo of recresid()
    studentize      : If x is a vector, subtract its mean and divide
    unstudentize    : returns reverse studentized vector
    unstudentize_d  : demonstrate unstudentize function