We would not expect that the mean should be over 160, or in one case, 150, after only 100 days trading, right?
我们本来觉得平均值应该大于160。,或者在一个例子中是150,这是100天之后的?
Because, what do you think the mean should be, if I simulate various things that the bias of 0?
因为,如果我用0作为偏向值,你觉得我会得到多少的平均值呢?
One is that 2,000 calories is the average for the typical person, but, of course, people have greatly differing calorie needs.
一是2000卡路里是常人所需的平均值,当然,人们需要的热量是大大不同的
And in 2005, we had a class that didn't trust each other at all I guess, because the average was twenty-three.
在2005年,我想有这个班的同学并不互相信任,因为平均值是23
So, sometimes people get confused when they're solving problems and call the amplitude this distance all the way from the max to the min but it's only half of that because we're only going back to the average level.
解题的时候会弄错,把这个从,最大值到最小值的距离,叫做幅值,但实际上,只有它的一半,只是它和平均值的差距。
But they're accountable and we can list all possible values when they're discrete and form a probability weighted average of the outcomes.
但随机变量是离散的话,我们可以把所有的可能值列出来,然后算出加权平均值
You see you cannot tell the height or the depth rather of a pool based on the average.
只知道平均值,并不知道游泳池的水深。
If I want to take the average energy of all of those, what I can do is go over to my data set.
如果我想得到这所有电子能的平均值,我就得去看一下我的数据库。
It's an average, it doesn't give you enough detail.
它只是平均值,不能提供足够的细节
Two-thirds of the average was 9 and some of you chose 9, so if you are here, stand up.
平均值的2/3是9,有人选了9,所以如果你选了9请起立
It sets the mean to 0, for s in stocks and then for s in the stocks, it moves it, giving it the bias and the momentum, then it shows the history.
它会让平均值等于,然后,它会改变它们的值,给它一个偏向值和股价势头值,然后它就会显示历史。
And then computes the mean of, getting me the mean of all the stocks in it.
然后再计算平均值,所有股票的平均值。
Can you imagine a study of relationships throughout human history ? that focuses on the average?
你能想象,对整个人类历史上的恋爱关系进行研究,并求平均值吗?
People also call that the mean or the average.
也可以叫做平均值
Well, let's do the smoke test number one: is the mean more or less what we expected?
好了,让我们先做1号发烟测试:,这个平均值是和我们想要的答案差不多吗?
I don't know what the average would be if I chose a different bias.
我不知道如果我选择别的平均值的话,平均值会是多少。
In 2003, the average was eighteen and a half.
在2003,平均值是18.5
I start $100 as the average price of the stock, what should the average price of the stock be?
我把100美元作为股票的初始平均值,你们觉得这个股价的平均值应该是多少呢?
They may fluctuate wildly, but if I look at enough stocks, the average should be right around 100.
他们可能会有很大的改变,但是如果我看过足够多的股票,平均值还是应该在100左右。
And then I could also do a Gaussian one here, with the mean of and the standard deviation of volatility divided by 2.
然后我在这里再写一个高斯分布的函数,它的浮动值的平均值和,标准偏差值都除了2。
The natural thing to do would be to average them up, right?
很自然的想法是对收益率求平均值
We have expected value, mean or average.
我们可以用期望值,或者是平均值
That's called the expected value.
这个加权平均值就是期望值
would have been the winning answer had everyone assumed that the average would have been constantly compounded down to 1, but since a couple of people chose the, I mean not incorrect answers, but the higher averages, then it was pushed up to 13.
如果大家都认为,平均数会一直下降到1的话,1应该是最终的答案,但是由于一部分人选择了,并不是说是错误的,但是却高于平均值的数,就把平均数推高到了13
So you see what it is--it's a measure of how much x deviates from the mean, but it's squared.
你会看到,这个指标,衡量的是x与平均值的偏离,而且这里有个平方
It could be normal, everything, that would be a Gaussian, where if you recall there was a mean, and a standard deviation, and most values were going to be close to the mean.
可能是正态分布,也就是高斯分布,只要有平均值和标准偏差值,你就可以进行调用,大部分的值都是集中在平均值附近的。
The average. I'm going to think of it that way.
来取平均值了。
Where should the mean be now?
现在的平均值会是多少?
应用推荐