merging two dataframes
Thank you Petr! I have read on the merge help page, but I cant figure out how to write
this
function. When I use your function it includes all data from "data3", but all
columns
in "data" has "NA"(without "name" and "date". I hoped to keep these
values Because name and date common columns and you do not need them twice. Merge shall work as you expected provided input data are OK. The result of command I suggested shall be all values from both data frames aligned by name and date. It is impossible to say what is wrong without reproducible data. Did you check size of your data frames after merge? I suspect that date in data and date in data3 is somewhat different. You shall check it with ?str function. As Posting guide says you shall provide some suitable data so that we can look at it and work with it. Something like dput(data[1:20,]) could be enough. Regards Petr
to. I try to explain it more precise: In "data" with 14000 observations about company name, date, size of
dividend
etc. In "data3" there are 800000 daily observations of the stockprices for
each
company listed: name date div statoil 17.05.2000 5 statoil 18.05.2001 6 ........ .............. ... Yara 17.05.2000 10 etc I want to get the stockprice for statoil, yara etc from "data3", and
merge
it into a new data like this: name date div price statoil 17.05.2000 5 120 statoil 18.05.2001 6 130 ........ .............. ... Yara 17.05.2000 10 200 etc And also keep the rest of the columns from both datasets. name date div price industry secid etc statoil 17.05.2000 5 120 ....... ..... ... statoil 18.05.2001 6 130 ....... ...... .... ........ .............. ... Yara 17.05.2000 10 200 ..... ...... ... etc Using the first function i get this result: name date div price industry secid etc statoil 17.05.2000 NA 120 ....... ..... ... statoil 18.05.2001 NA 130 ....... ...... .... ........ .............. ... Yara 17.05.2000 NA 200 ..... ...... ... Hope you understand what i want to do. Thanks again, I really appreciate it! etc -- View this message in context: http://r.789695.n4.nabble.com/merging-two- dataframes-tp3932869p3933101.html Sent from the R help mailing list archive at Nabble.com.
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