Dear all,
My aim is to estimate a model with country and year fixed effects. I both have a variable with the years in long format, and a series of dummy variables for each year.
My concern arises because I have different estimates and standard errors depending on whether I am using
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Year*
or
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i.Year
in my model.

The model looks something like this
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xtreg y x1 x2 x3 i.Year, fe robust cluster(id)
. However if I estimate the model in the thus:
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xtreg y x1 x2 x3 Year*, fe robust cluster(id) ​​​​​​​
estimates change and in general, appear to be more significant. Does anyone know why this is the case? I thought these two syntaxes where synonyms. Which estimates are more reliable if my aim is to account for unobserved time heterogeneity?

Thank in advance for your help