zhang chi wrote:
> I write three line porgram as following:
> rt = r.read_table("exam0203.txt", header=1)
> lm_sol = r.lm("Weight ~ Height", data = rt)
> r.summary(lm_sol)
>
> the first line is to read a file
> the second line is to make a linear regression
> the third line is to display the content of variate lm_sol
>
> but there is nothing to display. why?????
Try each line one at a time in the Python console and you might see
something. I see this:
>>> lm_sol = r.lm("Weight ~ Height", data = rt)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
rpy.RException: Error in terms.default(formula, data = data) :
no terms component
- so its the lm that is failing and not the summary.
You need to make your formula into a formula, because otherwise R
thinks it's a character string. Just wrap it in a r() call:
>>> lm_sol = r.lm(r("Weight ~ Height"), data = rt)
You're eventually going to have to play with the conversion mode too,
just read this handy guide to doing regressions in Rpy:
http://www2.warwick.ac.uk/fac/sci/moac/currentstudents/peter_cock/python/lin_reg/
Barry
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