[R] linear models with factors

[ATANU]

i am trying to fit a linear model with both continuous covariates and
factors. When fitted with the intercept 
term the first level of the factor is treated by R as intercept and the
estimate of the effects of remaining levels(say i th level)  are given as 
true estimate of i th level - estimate of 1st level.can any please help me?
thanks in advance.....
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