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But there is always the danger that the observed relationships in the model are not truly causal but reflect the common influence of some unobserved variable which persists over time.
The lagged nature of the endogenous variables may help to reduce the significance of this problem, but because we might expect the unobserved factors to persist over time, that is, z it + 1 = z it + 1 z it ), this problem may still arise.
In contrast, the association between sending remittances and intermarriage persists even when I control for unobserved variables, indicating that remittance behaviour changes with intermarriage.
In our study, though we use proxy measures of preference which may introduce additional noise, we still find evidence of an unobserved entrepreneurial ability affecting occupational choice, and the evidence persists even after controlling for taste for variety and risk aversion.
In sum, the unique features of the tea estates allow us to control to some extent for unobserved heterogeneity and socioeconomic and structural differences that persist across castes (and individuals) in rural India today.
In the next 20 years the gravitational attraction of an unobserved planet was suspected to be the cause of Uranus's persisting deviations.
Stronger lipid partitioning of E46K αS persists even with the lipid limiting condition removed, as residues up to position 53 are unobserved for this variant.
The fact that these novel RV lineages often come from historically unobserved areas points to the latter explanation, but it still remains unclear whether these viruses persist independently in the sampled animals or some other reservoir.
"Very little is unobserved".
Am I alone, And unobserved?
So much for playing the unobserved observer.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com