[R] how to solve the step halving factor problems in gnls and nls

From: Yimeng Lu <yl2058_at_columbia.edu>
Date: Mon 18 Jul 2005 - 09:38:18 EST


Hi R-users,

Could you give me some advice in
solving the problem of such error message from gnls and nls? ## begin error message

"Problem in gnls(y1 ~ glogit4(b, c, m, t, x), data.frame(x..: Step halving
factor reduced below minimum in NLS step "

##and

"Problem in nls(y ~ 1/(1 + exp((xmid - x)/scal)), data = x..: step factor
reduced below minimum "?

Thank you in advance.

Hanna

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