converting to weka arff format - weka

Question

i want to convert the file in this link : http://archive.ics.uci.edu/ml/datasets/Credit+Approval to match weka .arff file and open it there.
i know that we need to define the file like:
#relation
#attribute
#data
i found the data, but didn't found the attributes! also the relation is the file name right ?
and one last thing how to make file extension .arff ?
please help.
Thank You SO MUCH!!

Answer 1

In crx.names from data folder, says : All attribute names and values have been changed to meaningless symbols to protect confidentiality of the data.
But they give you the values that they use:
Attribute Information:
A1: b, a.
A2: continuous.
A3: continuous.
A4: u, y, l, t.
A5: g, p, gg.
A6: c, d, cc, i, j, k, m, r, q, w, x, e, aa, ff.
A7: v, h, bb, j, n, z, dd, ff, o.
A8: continuous.
A9: t, f.
A10: t, f.
A11: continuous.
A12: t, f.
A13: g, p, s.
A14: continuous.
A15: continuous.
A16: +,- (class attribute)
You can give to this information, the meaning that you need.
For create this to arff file you write something like that:
%Test Data set
#relation Credit Approval Data Set
#attribute attribute_name {a,b}
#attribute ...
#data
b,30.83,0,u,g,w,v,1.25,t,t,01,f,g,00202,0,+
Add the next attribute reading the credit.lisp, you need 16 attributes.
Save the file how: name file.arff. You can create this file in a text editor of your preferred.

Answer 2

If you want to follow GUI based approach then
1) open crx.data in any editor.
2) Add a column heading at the first line like:
A1,A2,A3,A4,A5,A6,A7,A8,A9,A10,A11,A12,A13,A14,A15,Class
3) Save the file as crx.csv
4) Open Weka -> Explorer
5) In preprocess tab -> Click on Open file
6) Change file type csv
7) Locate the file 'crx.csv`
8) Click on Save
9) Specify the file name crx.arff.
That's done.