金程問(wèn)答
一小時(shí)三分鐘的地方，老師說(shuō)偏度大于0，但是偏度是三次方肯定有負(fù)數(shù)，為什么他是大于0？
老師好，能幫忙分析一下C選項(xiàng)嗎，不太清楚。
視頻解析里的原話就是說(shuō)我要拿P紙和T統(tǒng)計(jì)量進(jìn)行比較
這個(gè)題怎么計(jì)算
老師是不是說(shuō)反了呀，不應(yīng)該是雙尾的百分之2.5，單尾的百分之五嗎
樣本量16＜30，為啥不用t分布呢？
第三問(wèn)的解答，組合的方差，根據(jù)線性關(guān)系，為啥不是2*0.2*0.8*協(xié)方差呢
BLUE 里的 linear 如何理解？為什么sample variance S^2 不符合linear的條件？ 單說(shuō)linear relationship也明白是什么， 但是這個(gè)情境里就不能理解了
為什么課本上的移動(dòng)平均模型上面沒(méi)有長(zhǎng)期平均數(shù)呢
老師這道題為什么和官網(wǎng)不一樣，官網(wǎng)是：A quantitative analyst at a proprietary trading firm is incorporating unsupervised machine learning (ML) algorithms into the firm’s technical analysis of equities by using K-means clustering. The clustering algorithm will be applied to continuous volatility data in order to group observations into clusters that can be used to identify the current market regime. Since clusters close to each other are likely to exhibit similar characteristics, the analyst measures the distances between the observations within each cluster and the centroid of that cluster. If the analyst wants to ensure that the minimum distance is obtained for the continuous data clusters when applying the K-means algorithm, which measure should be used to achieve the desired outcome? A.Euclidean distance B.Manhattan distance C.Cook’s distance D.Gini measure麻煩解答一下
S^2不是best 但是是unbais?
異方差違背了五條回歸假設(shè)中的哪一條
這里用最小二乘法獲取什么參數(shù)，又怎么計(jì)算誤差
app更新之后，緩存視頻不能倍速播放了
協(xié)方差穩(wěn)定為什么就autocorrelation穩(wěn)定？
程寶問(wèn)答
