This formula used inverse regression and data fusion technical and maximum likelihood theory , then this method enabled random sample value obtained in ultrasonic and rebound method of different detection population to mix together effectively , and reach estimation of concrete strength 該公式利用逆回歸理論、數(shù)據(jù)融合技術(shù)和最大似然原理,將回彈值和聲速值分別看作被解釋變量,將來(lái)自超聲法和回彈法不同量綱的檢測(cè)數(shù)據(jù)進(jìn)行有效融合,得出混凝土強(qiáng)度的推定值,該推定結(jié)果具有無(wú)偏性和方差最小性質(zhì)。