dear R users,
my data looks like this
PM10 Ref UZ JZ WT RH FT WR
1 10.973195 4.338874 nein Winter Dienstag ja nein West
2 6.381684 2.250446 nein Sommer Sonntag nein ja Süd
3 62.586512 66.304869 ja Sommer Sonntag nein nein Ost
4 5.590101 8.526152 ja Sommer Donnerstag nein nein Nord
5 30.925054 16.073091 nein Winter Sonntag nein nein Ost
6 10.750567 2.285075 nein Winter Mittwoch nein nein Süd
7 39.118316 17.128691 ja Sommer Sonntag nein nein Ost
8 9.327564 7.038572 ja Sommer Montag nein nein Nord
9 52.271744 15.021977 nein Winter Montag nein nein Ost
10 27.388416 22.449102 ja Sommer Montag nein nein Ost
.
.
.
.
til 200
I'm trying to make a linear regression between PM10 and Ref for each of the
four WR, I've tried this:
plot(Nord$PM10 ~ Nord$Ref, main="Nord", xlab="Ref", ylab="PM10")
but it does not work, because "Nord cannot be found"
what was wrong? how can I do it? please help me
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