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From |
"M. Douglas Berg" <eco_mdb@shsu.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: reshape long does not recognize negative date values |

Date |
Wed, 15 Sep 2004 09:59:03 -0500 |

Thank you!

I implemented your suggestions and they worked like a charm. I appreciate your help.

I also wish to thank Jean Ries for replying.

Doug Berg

Nick Cox wrote:

You are putting the blame in the wrong place, I think.

-insheet- tries hard to convert your "labels", meaning not Stata labels, but column headers in your file, into variable names, but "-" is not legal within variable names and if it is stripped the problem then will be that "p-1" and "p1" cannot be distinguished. So it seems

that your variable names will get messed up well before -reshape- ever sees them. The problem therefore is the implicit assumption that -insheet- will break Stata's rules to satisfy your preferences.

One work-around is this:

Your .csv file, it seems, has a first line something like this:

permid,p-2,p-1,p0,p1,p2

Change the "permid" to "id".

Change all the "-" signs to underscores "_". "_" is allowed within variable names. You should be able to do this easily in any text editor.

Now -insheet- as before.

. reshape long p, i(id) j(qtime) string

The change of name of -permid- to -id- stops -permid- getting bundled in with variables whose names start with -p-. The -string- option flags that the underscores are OK, but time will be a string variable.

Now the underscores must be mapped back again:

replace qtime = subinstr(qtime,"_","-",1) destring qtime, replace

and you should be nearer where you want to be.

Nick n.j.cox@durham.ac.uk

M. Douglas Berg

I have a comma seperated (csv) file with quarterly data on variable p. The column headings are of the form p0, p1, etc for 1960q1, 1960q2. For periods prior to 1960 I labelled the columns p-1, p-2, etc for 1959q4, 1959q3.*

I use the command :

insheet using qp.csv

to input the data into Stata.

Then I do the following:

reshape long p, i(permno) j(qtime)

format qtime %tq

Stata then creates variable v1, v2, v3, .... for all of the dates prior to 1960q1.

How should I specify the dates in the csv file so that Stata picks them up correctly?

* For searches and help try:

* http://www.stata.com/support/faqs/res/findit.html

* http://www.stata.com/support/statalist/faq

* http://www.ats.ucla.edu/stat/stata/

* * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: RE: reshape long does not recognize negative date values***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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