Economics Job Market Rumors Topic: Referee didn't know that conditional expectation is a random variable
https://www.econjobrumors.com/topic/referee-didnt-know-that-conditional-expectation-is-a-random-variable
Economics Job Market Rumors Topic: Referee didn't know that conditional expectation is a random variableen-USTue, 23 Apr 2019 12:35:30 +0000http://bbpress.org/?v=1.0.2<![CDATA[Search]]>q
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Economist on "Referee didn't know that conditional expectation is a random variable"
https://www.econjobrumors.com/topic/referee-didnt-know-that-conditional-expectation-is-a-random-variable/page/4#post-3511784
Mon, 15 May 2017 17:04:53 +0000Economist3511784@https://www.econjobrumors.com/<p>There are two types of people in this thread.</p>
<p>Those that understand that a (real-valued) random variable is any measurable mapping from the "sample space" of a probability space into the real numbers.</p>
<p>Those that have a calc 1 or lower understanding of probability, and think "random variable" means a symbol X which has a non-degenerate probability mass/density function attached to it.
</p>Economist on "Referee didn't know that conditional expectation is a random variable"
https://www.econjobrumors.com/topic/referee-didnt-know-that-conditional-expectation-is-a-random-variable/page/3#post-3511746
Mon, 15 May 2017 16:47:49 +0000Economist3511746@https://www.econjobrumors.com/<p>Kill yourself, 1fae. If you haven't taken graduate courses in probability, then you probably shouldn't be speaking.</p>
<blockquote><blockquote>
<blockquote>
<blockquote><p>1BEC has never take a graduate course in probability theory, confirmed.
</p></blockquote>
<p>Well I did but got a C. So point taken.
</p></blockquote>
<p>Haha. Random variables are functions. Conditional expectations are also random variables (and hence functions). Realizations of random variables are the functions evaluated at a given point in the probability space.</p></blockquote>
<p>"Random variables are functions." Give me break.
</p></blockquote>Economist on "Referee didn't know that conditional expectation is a random variable"
https://www.econjobrumors.com/topic/referee-didnt-know-that-conditional-expectation-is-a-random-variable/page/3#post-3511631
Mon, 15 May 2017 15:30:58 +0000Economist3511631@https://www.econjobrumors.com/<blockquote><p>
"Random variables are functions." Give me break.
</p></blockquote>
<p>It's okay that you don't know anything about probability theory as long as you don't pretend that you do.
</p>Economist on "Referee didn't know that conditional expectation is a random variable"
https://www.econjobrumors.com/topic/referee-didnt-know-that-conditional-expectation-is-a-random-variable/page/3#post-3511191
Mon, 15 May 2017 08:16:08 +0000Economist3511191@https://www.econjobrumors.com/<p>Conditional expectation E[X|Y] is a r.v. when each of X, Y is a r.v.</p>
<p>A special case is E[X|1_A], where A is some event. This r.v. takes two values: one in event A and one in its complement. (If A has nonzero probability, then the value on A is pinned down uniquely.)</p>
<p>When A has nonzero probability, we sometimes write E[X|A] to mean the value that the r.v. E[X|1_A] takes on A: this value is just a number.
</p>Economist on "Referee didn't know that conditional expectation is a random variable"
https://www.econjobrumors.com/topic/referee-didnt-know-that-conditional-expectation-is-a-random-variable/page/3#post-3511086
Mon, 15 May 2017 05:20:20 +0000Economist3511086@https://www.econjobrumors.com/<p>E[Y|X] is an RV. E[Y|X=x] is not.</p>
<p>OP's manuscript was probably unclear.
</p>Economist on "Referee didn't know that conditional expectation is a random variable"
https://www.econjobrumors.com/topic/referee-didnt-know-that-conditional-expectation-is-a-random-variable/page/3#post-3511037
Mon, 15 May 2017 04:31:12 +0000Economist3511037@https://www.econjobrumors.com/<p>well, PhDs are not any smarter than undergrads based on the evidence from this thread</p>
<p>-undergrad
</p>Economist on "Referee didn't know that conditional expectation is a random variable"
https://www.econjobrumors.com/topic/referee-didnt-know-that-conditional-expectation-is-a-random-variable/page/3#post-3511031
Mon, 15 May 2017 04:18:31 +0000Economist3511031@https://www.econjobrumors.com/<p>OP, it isn't going to get any better. I had a referee reject a paper because the proof was wrong. It wasn't wrong, as confirmed by numerous econometricians. But what can you do? I pointed this out to the AE and he just ignored it.</p>
<p>If people want to reject you they will do it. In finance, where we still do BS like Fama-Macbeth and worse, you can get rejected for being correct but the referee being dumb. Honestly, I'd get out: finance academia is decaying.
</p>Economist on "Referee didn't know that conditional expectation is a random variable"
https://www.econjobrumors.com/topic/referee-didnt-know-that-conditional-expectation-is-a-random-variable/page/3#post-3511025
Mon, 15 May 2017 04:04:05 +0000Economist3511025@https://www.econjobrumors.com/<p>Any random variable (not only conditional expectation) is a scalar when you take it with respect to an event (just as a function).</p>
<blockquote><p>^ wikipedia says it's a random variable when you take it with respect to a random variable, or a sub-sigma algebra, but it's a scalar when you take it with respect to an event.<br />
both senses are frequently used, which is the root of all the dumb confusion and pedantry in this thread.
</p></blockquote>Economist on "Referee didn't know that conditional expectation is a random variable"
https://www.econjobrumors.com/topic/referee-didnt-know-that-conditional-expectation-is-a-random-variable/page/3#post-3510901
Mon, 15 May 2017 02:03:26 +0000Economist3510901@https://www.econjobrumors.com/<blockquote><blockquote>
<blockquote>
<blockquote><p>1BEC has never take a graduate course in probability theory, confirmed.
</p></blockquote>
<p>Well I did but got a C. So point taken.
</p></blockquote>
<p>Haha. Random variables are functions. Conditional expectations are also random variables (and hence functions). Realizations of random variables are the functions evaluated at a given point in the probability space.</p></blockquote>
<p>"Random variables are functions." Give me break.
</p></blockquote>
<p>Yes, they are functions, by definition.
</p>Economist on "Referee didn't know that conditional expectation is a random variable"
https://www.econjobrumors.com/topic/referee-didnt-know-that-conditional-expectation-is-a-random-variable/page/3#post-3510810
Mon, 15 May 2017 00:53:23 +0000Economist3510810@https://www.econjobrumors.com/<blockquote><blockquote>
<blockquote>1BEC has never take a graduate course in probability theory, confirmed.
</p></blockquote>
<p>Well I did but got a C. So point taken.
</p></blockquote>
<p>Haha. Random variables are functions. Conditional expectations are also random variables (and hence functions). Realizations of random variables are the functions evaluated at a given point in the probability space.</p></blockquote>
<p>"Random variables are functions." Give me break.
</p>