Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

st: Inflection point

From   "Francesco Burchi" <>
To   <>
Subject   st: Inflection point
Date   Wed, 14 Apr 2010 11:17:30 +0200

Dear statalisters,

I have run the following IV estimates:

ivreg2 wage EDU EDUSquared X1 X2 (X3=Instrument1) X4 X5 X6 X7, robust 

I would like to calculate the inflection point of EDU (=years of
schooling). Therefore, I have used the following formula:
Is this the right way to calculate the inflection point? I am surprised
that I don't use the standard deviation in the formula. Moreover, is
there a way to show graphically the effect of EDU controlling for all
the other covariates (including the squared form and the endogenous
variable X3) and visualizing the inflection point?
Finally, should I use also the cubic form to see whether eventually
there is more than one inflection point?

I am using Stata 10.

Thanks in advance for your precious help,


*   For searches and help try:

© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index