The Russians Are the Fastest in Marathon Cross-Country Skiing: The “Engadin Ski Marathon”

Table 1

Coefficients () and standard errors (SE) from multivariate regression models for race time by sex and nationality.

Parameter		SE
Intercept	10283.55	9.92	<0.001
Nation	92.20	3.07	<0.001
Sex = women	1403.10	23.50	<0.001
Sex = men	0	0
Sex = women × nationality	63.34	7.23	<0.001
Sex = men × nationality	0	0

This parameter was set to zero because it was redundant.