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st: AW: apostrophes, quotation marks, left or right quotes?


From   Martin Weiss <martin.weiss1@gmx.de>
To   statalist@hsphsun2.harvard.edu
Subject   st: AW: apostrophes, quotation marks, left or right quotes?
Date   Tue, 26 Feb 2008 09:42:03 +0100

Dirk,

you are definitely spilling way too much ink on a small quirk. Your
criticism seems warranted from a German standpoint, but then again you do
not have a German Stata edition, do you?

I know that your issue can bug you, particularly if you use several packages
and each one comes with its own peculiarities. But still, the real hurdle is
to understand the macro expansion process induced by the left and right
quotes. To my - possibly limited - knowledge, there is no single place where
you can learn it satisfactorily. In particular, the nesting mentioned by
Nick has given me headaches too many times. In fact, I still use a
trial-and-error process, coupled with -set trace on- (and the concomitant
cluttered screen) to figure it out in complicated cases...

Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Dirk Enzmann
Gesendet: Montag, 25. Februar 2008 22:38
An: statalist@hsphsun2.harvard.edu
Betreff: st: apostrophes, quotation marks, left or right quotes?

How does one produce left and right single quotes as they are used in Stata?

Meanwhile, I know the answer. But because I am using Stata only 
occasionally, every now and then I encounter typical beginners' 
problems. Thus, it took me a while to find the correct answer and I 
would like to comment on the difficulties hoping that this might improve 
the situation of other beginners having the same problem.

Although I searched in "An introduction to Stata ..." by Svend Juul, 
searched the release 9 "Getting started with Stata", [U] "User's Guide", 
and [P] "Programming", and searched the internet (FAQ, statalist), it 
took me more than half an hour to find the solution (ultimately by trial 
and error).

I think the difficulty is due to a combination or an accumulation of 
three things:
(1) I am using a non-English/American keyboard (German);
(2) The letter type used in printing (especially the Stata manuals!) 
makes it impossible to decide how the correct quote should look like on 
the screen;
(3) To find the answer you have to ask the correct question, but for 
non-English speakers it is difficult to find the denotation of the signs 
as used by the Stata community.

Let us start with the latter: In German we denote the signs "Hochkomma". 
Looking this up in a standard dictionary renders "apostrophe". Searching 
the indices of the manuals or the internet for "apostrophe" does not 
help. Next, I tried "quotation mark". But alas, ... You have to look for 
"left quote" or "right quote", but how should I know if I don't know the 
answer already?

Browsing through the pages of the a.m. books did not help. Every time I 
found examples using the quotes there were no indications on how to 
produce the quotes using my keyboard. The problem: In printing the left 
quote is a curved quote similar to a small round left bracket - similar 
to "(" -, the right quote curved like a right bracket ")". However, 
there are three different single quotes I can create with my keyboard: 
One "forward" quote (similar to the forward slash "/"): |´|, one 
"backward" quote (similar to the backslash "\"): |`|, and one vertical 
quote (similar to the OR sign "|"): |'|. Why don't they use one of these 
in the printed manuals? Why? Everything would be so much easier!

Finally, after I solved the problem, I found the following exchange in 
the Stata list (thread "Help with Reading Arguments for Do-File" 
http://www.stata.com/statalist/archive/2005-11/msg00499.html ): George 
wrote "Thanks, the quotation marks were indeed the source of the 
problem. Unfortunately, the manual does not make that clear." to which 
Nick (n.j. cox) responded: "Many people have been bitten by this at 
precisely your stage, but it is wrong to blame the manuals. I find at 
[U] 18.3.1 (p.200 of Stata 9 edition) that the key difference between 
left and right single quotes is explained when local macros are introduced."

To the contrary, it *is* the manuals to blame! If you read p. 200 of the 
Stata 9 edition you find: "... we use a left single-quote (located at 
the upper left on most keyboards), ... and a right single quote (located 
under the " on the right side of most keyboards)...". This description 
does not help at all if you are using a non-English/American keyboard! 
And what is more: In printing they always use the small "(" ")" quotes 
(forward-backward-curved), so that it is really *impossible* to 
recognize the correct quote. Why make it so difficult? Why not print it 
as it should look like? Why not *print* `shortcut' ?

On the German keyboard, I have to use the "accent grave" (thus, the 
apostrophe starting on the top left) for the left single quote, and for 
the right single quote I have to use the "common" single quote (the 
vertical quote you find above the #-sign on a German keyboard ;-) , see:
http://upload.wikimedia.org/wikipedia/commons/thumb/3/36/KB_Germany.svg/400p
x-KB_Germany.svg.png

Ultimately, the best description I found in Svend Juuls "An Introduction 
to Stata ...":

"Hint: Producing the left single quote: In this book, the appearance of 
single quotes differs a bit from how they look on your keyboard and 
screen. Try 'help quotes' to see how they look on the screen. Keyboard 
layouts differ, and on some keyboards, the left single quote is produced 
by a dead key, meaning that nothing is produced until you hit the 
spacebar." (p. 269)

If it is impossible to print the quotes in the manuals as they look on 
the screen (and on the keyboard) - please, take over Svend Juuls 
exemplary description.

I hope that this lengthy comment helps future beginners and demystifies 
Nicks observation that "Many people have been bitten by this". Bites are 
necessary for computations but aren't helpful at all for learning.

Dirk

*************************************************
Dr. Dirk Enzmann
Institute of Criminal Sciences
Dept. of Criminology
Schlueterstr. 28
D-20146 Hamburg
Germany

phone: +49-(0)40-42838.7498 (office)
        +49-(0)40-42838.4591 (Mrs Billon)
fax:   +49-(0)40-42838.2344
email: dirk.enzmann@uni-hamburg.de
www: 
http://www2.jura.uni-hamburg.de/instkrim/kriminologie/Mitarbeiter/Enzmann/En
zmann.html
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