# st: RE: RE: graphing question

 From "Rajesh Tharyan" <[email protected]> To <[email protected]> Subject st: RE: RE: graphing question Date Thu, 6 Apr 2006 12:52:32 +0100

```Nick C, Nick W & Newson Roger,

The table is the output of a event study (a very common procedure in
corporate finance and other fields..). The percentage represents average
daily abnormal returns for a sample of companies and time represents days
relative to event, with time 0 being the day of the event. The significance
levels could be from any of the statistical tests that are used in this
context. I didn't think anyone would be interested in this that why I didn't
mention it.

I was wondering really if I could put an if option on mysym, which I now
know is not possible. I intend to put four such tables into one graph, So
that I can explain the results with just one picture.

Thanks again for your help. I will reconsider the putting four in one
method!!

rajesh

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Nick Cox
Sent: 05 April 2006 21:14
To: [email protected]
Subject: st: RE: graphing question

Setting aside the issue of multiplicity raised
by the numerous simultaneous -- and mutually
dependent -- tests possibly implied here,

you can use -separate- to produce two distinct
response variables from one, and then employ
distinct symbols.

It would still be a propaganda graph, to use
Tukey's term. (In revenge against poor referencers,
I'll just give Tukey 1972 as the reference.)

It might be more subtle to use (say) a line to indicate
threshold levels and let the user think about
the graph without the propaganda. Is the
difference between 0.05% and 0.04% scientifically
interesting as well?

Nick
[email protected]

Rajesh Tharyan

> Say I have a table which looks like this the *** shows the
> values which are
> significant. Of course I can plot the percentages against
> time. Is there
> someway to highlight the significant values in the
> graph...Say for example
> by changing the size of the symbols only for the significant values.
>
> Time	percentage
>
> -80	-0.02%
> -70	-0.01%
> -60	-0.04%
> -50	-0.05%
> -40	-0.05%
> -30	-0.07%***
> -20	-0.07%***
> -10	-0.16%***
> -5	-0.19%***
> -3	-0.17%***
> -2	-0.21%***
> -1	-0.27%***
>  0	 0.09%***
>  1	 0.22%***
>  2	 0.09%***
>  3	 0.08%***
>  5	 0.05%***
>  10	 0.04%
>  20	 0.02%
>  30	-0.01%
>  40   -0.03%
>  50	 0.02%

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