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Dans l’Univers, tout est affaire de gravitation. C’est la gravitation qui fait tourner la Lune autour de la Terre. C’est la gravitation qui fait tourner la Terre autour du Soleil, et c’est encore la gravitation qui entraîne le Soleil dans le mouvement de notre galaxie. Il y a donc une relation très forte entre la masse et le mouvement des corps célestes. C’est à partir de ce constat que Fritz Zwicky, au début des années 30, observe l’amas du Coma.
Multiple estimations Note that since version 0.8.0, multiple estimations can be performed at once without requiring loops. Let’s replicate the previous example using fixest stepwise functions: res_multi = fepois(Euros ~ log(dist_km) | csw0(Year, Destination, Origin), trade) The previous line of code performs 4 estimations. The function csw0 is the key here, it means: cumulative stepwise starting with the empty element.
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