Hi All
Not sure about mailing list etiquette but I thought it would good to post a
solution for others. Thanks for the quick help!
# Purpose: test the rpy python bindings with the R plm package (Panel Data)
import rpy
# test data - the plm package needs the individual and time info in the first
two columns of data.frame
id = [1,1,1,2,2,2,3,3,3,4,4,4]
year = [1970,1971,1972, 1970, 1971, 1972, 1970, 1971, 1972, 1970, 1971, 1972]
y = [2170, 2655, 1345, 2560, 2330, 3325, 2747, 3735, 3265,3453, 4653, 4563]
x1 = [33, 26, 33, 34, 24, 18, 25, 36, 20, 35, 56, 23]
x2 = [500, 654, 390, 845, 234, 458, 233, 234, 853, 345, 346, 345]
rpy.set_default_mode(rpy.NO_CONVERSION)
testdata = rpy.r.data_frame(ids=id, years=year, ys=y, x1s=x1, x2s=x2)
testdata_1 = rpy.r.plm_data(testdata, index = rpy.r.c("ids", "years"))
stuff = rpy.r.plm(rpy.r("ys ~ x1s"), data=testdata_1, model="within")
rpy.set_default_mode(rpy.BASIC_CONVERSION)
results = rpy.r.summary(stuff)
print results
Thanks for the help.
Ryan
>>> Peter <rpy-l...@maubp.freeserve.co.uk> 04/25/09 8:21 AM >>>
On 4/25/09, Ryan Banerjee-R <banerje...@econ.umd.edu> wrote:
>
> Hi
>
> I am trying to use the "plm" panel data package in R through Rpy.
> ...
> stuff = rpy.r.plm(("ys ~ x1s"), data=testdata_1, model="within")
>
> rpy.set_default_mode(rpy.BASIC_CONVERSION)
>
> results = rpy.r.summary(stuff)['CoefTable']
>
> The program stumbles at:
> File "py_rTest.py",
> stuff = rpy.r.plm(("ys ~ x1s + x2s"), data=testdata_1, model="within")
> rpy.RPy_RException: Error: inherits(object, "formula") is not TRUE
>
> I any ideas how to get this working?
I suspect the problem is how you are trying to supply the formula (you
just used a string, "ys ~ x1s"). Read this:
http://www.warwick.ac.uk/go/peter_cock/python/lin_reg/#lm which should
help.
Peter
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