Difference in Difference With Continuous Treatment
Difference in Difference with a continuous treatment
- Thread starter Danx
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Danx Asks: Difference in Difference with a continuous treatment
I am currently doing a research about the effects on labour market of Venezuelan migration in Peru. For the first step I want to get the effects of natives mean wages in the three biggest cities in terms of population due to the recent mass migration. In order to do this model, I got the yearly mean wages by city, from a large dataset of yearly labour market surveys (Cross-sectional data from 2014 to 2019) and the yearly migration share on cities' population which starts in 2017, this means that the treatment variable is 0 before 2017 and increases every year, since 2017, for each city with different intensity. Before the year 2017, where the mass migration started, there is a parallel trend in mean wages between this 3 cities which also share cultural demographics.
So I tried this code:
didregress (cities_wmean) (legshare_cities, continuous), group(cities) time(year)
cities_wmean: It is a variable which is equal to the cities' mean wage. the value is the same for each respondent within each city, due to previous coding. legshare_cities: I got legal migration share which is a proxy of the real migration, this variable goes from 0 to 1 because Stata does not accept a percentage variable, I would like to know if there is a different way to create a percentage variable.
cities: categorical variable that groups the cities' surveys respondents.
On the first try I did not set the 0 in the legal migrant share variable for the pre treatment time, so the regression p-value indicated a statistically significant effect of the treatment coefficient, this did not happen when I set the legal migrant share for the pre treatment time. The following graphs shows us this:
didregress (cities_wmean_n) (legshare_cities, continuous), group(cities) time(year) aeq
I would like to know if there is something wrong with my set up of this Diff. in diff. regression, what would be the meaning of the treatment coefficient if the set up is correct, and other suggestions.
Many thanks in advance.
- Harrys Kavan
- Computer Science
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a) Is it generally possible to make polynomial regression like in CNN where XGBoost approximates the data by generating n-polynomial function?
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I have a Dodge Charger 5.7 2016 (automatic transmission)
It shakes (the car) at 80-90 mph
its not like body problem no the car actually shakes a little if i remember correctly
the steering wheel does not shake
I can also feel the vibration in the throttle and brake pedal
the vibration happens even when gas or brake is not pressed
however at 90 mph when brakes are applied the car shakes even more violently
the problem started after I repaired things in front
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back to present problem, I tried braking strongly at low speed I didnt notice abnormalities
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I balanced the wheels but that didnt fix the problem
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ps: car service due this week
appreciate any help
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In a spherical coordinates system ($r$, $\theta$, $\phi$ ), assuming an angular rotation $\omega_z$ around the z-axis, the tangential velocity of a point can be expressed as:
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What happens if I have a rotation $\omega_x$ around the $x$-axis? What are the equation for the $V_y$ and $V_z$ velocity components of the point?
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Ian Gershon Teixeira Asks: Can solvable Lie groups have maximal subgroups?
cross-posted from MSE:
https://math.stackexchange.com/questions/4539025/can-solvable-lie-groups-have-maximal-subgroups
Many interesting manifolds can be expressed as $ G/H $ for $ G $ a Lie group and $ H $ a maximal closed subgroup. Examples include the projective spaces $ \mathbb{C}P^n \cong SU_n/U_{n-1} $ where $ U_{n-1} $ is maximal for $ n \geq 3 $, and $ \mathbb{R}P^n \cong SO_n/O_{n-1} $, again $ O_{n-1} $ is maximal for $ n \geq 3 $. Another example is the Poincare homology sphere $ SO_3(\mathbb{R})/A_5 $.
Solvmanifolds provide many interesting examples of manifolds, especially of torus bundles over tori (a solvmanifold is a manifold of the form $ G/H $ for $ G $ a solvable Lie group).
The examples I list above for manifolds $ G/H $, $ H $ maximal, all the have the property that $ G $ is semisimple (indeed simple).
This leads me to wonder about maximal closed subgroups $ H $ of solvable Lie groups $ G $. Do they even exist?
Let $ G $ be a connected Lie group.
If $ G $ is abelian then certainly $ G $ does not have any maximal closed subgroups. Does the same hold for $ G $ solvable?
Comment: Let $ G' $ be the commutator subgroup of $ G $. Let $$ Ab: G \to G/G' $$
be the abelianization map. If $ H $ is a maximal closed subgroup of $ G $ then we must have $$ Ab(H)=G/G' $$ because if $ Ab(H) $ was properly contained then $ Ab(H) $ would be a maximal closed subgroup of the connected abelian group $ G/G' $ which is impossible. In particular that implies that $ H $ does not contain $ G' $ (because if $ Ab(H)=G/G' $ and $ H $ contained $ G' $ that would imply that $ H $ is all of $ G $, contradicting maximality).
Source: https://solveforum.com/forums/threads/difference-in-difference-with-a-continuous-treatment.629769/