About the CIndex

[chengjianhong]

Is there an error in this function? The elif hazards[j] < hazards[i]: concord += 0.5 should be change to elif hazards[j] == hazards[i]: concord += 0.5. Right ?

def CIndex(hazards, labels, survtime_all):
    concord = 0.
    total = 0.
    N_test = labels.shape[0]
    for i in range(N_test):
        if labels[i] == 1:
            for j in range(N_test):
                if survtime_all[j] > survtime_all[i]:
                    total += 1
                    if hazards[j] < hazards[i]: concord += 1
                    elif hazards[j] < hazards[i]: concord += 0.5

    return(concord/total)

[Richarizardd]

Hi @chengjianhong - to clarify, we are using the CIndex_lifeline function from lifelines to compute the c-Index.