def estimate_lambda(pv):
    """estimate lambda form a set of PV"""
    LOD2 = sp.median(st.chi2.isf(pv,1))
    L = (LOD2/0.456)
    return (L)
def estimate_lambda ( pv ) : LOD2 = sp . median ( st . chi2 . isf ( pv , 1 ) ) L = ( LOD2 / 0.456 ) return ( L )
estimate lambda form a set of PV