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RE: st: growth rates


From   "Bornmann, Lutz" <[email protected]>
To   "[email protected]" <[email protected]>
Subject   RE: st: growth rates
Date   Fri, 7 Mar 2014 16:13:50 +0000

I agree. Thank you, Nick!

>-----Original Message-----
>From: [email protected] [mailto:owner-
>[email protected]] On Behalf Of Nick Cox
>Sent: Friday, March 07, 2014 3:11 PM
>To: [email protected]
>Subject: Re: st: growth rates
>
>Maarten's [sic] advice is probably the most relevant here. I'd expect
>positive numbers and exponential growth as a zeroth approximation, so
>fractional growth rate is good not only for tracking individual
>countries but also for comparing different countries.
>Nick
>[email protected]
>
>
>On 7 March 2014 14:02, Bornmann, Lutz <[email protected]> wrote:
>> Thanks, Marten for this first solution.
>>
>> Nick, I am looking for advice on how to measure growth. Martens solution
>standardizes the annual changes in publication numbers. Are there other
>options and how can I get an overall growth value with which I can compare
>several countries?
>>
>> Lutz
>>
>>>-----Original Message-----
>>>From: [email protected] [mailto:owner-
>>>[email protected]] On Behalf Of Nick Cox
>>>Sent: Friday, March 07, 2014 2:24 PM
>>>To: [email protected]
>>>Subject: Re: st: growth rates
>>>
>>>I don't get this. Do you have a definition of growth rate and want
>>>Stata code for this or do you want advice on how to measure it?
>>>
>>>For example, if something can ever be zero or negative, then even
>>>
>>>change in value / previous value
>>>
>>>can not be a good idea, because growing from -1 to 0 gives growth rate
>>>of -1 and growing from 0 to 1 gives an indeterminate value.
>>>
>>>so even that is not a universal.
>>>Nick
>>>[email protected]
>>>
>>>
>>>On 7 March 2014 13:12, Bornmann, Lutz <[email protected]>
>wrote:
>>>> Hi,
>>>>
>>>> I do have annual publication numbers for several countries:
>>>>
>>>> ITEM_PY us'     ch'
>>>> 1990    3759    119
>>>> 1991    3738    149
>>>> 1992    3757    149
>>>> 1993    3810    169
>>>> 1994    3920    199
>>>> 1995    4134    171
>>>> 1996    4404    211
>>>> 1997    4436    236
>>>> 1998    4513    246
>>>> 1999    4542    238
>>>> 2000    4456    275
>>>> 2001    4519    263
>>>> 2002    4602    259
>>>> 2003    4705    276
>>>> 2004    4836    310
>>>> 2005    4834    337
>>>> 2006    5150    344
>>>> 2007    5253    433
>>>> 2008    5568    466
>>>> 2009    5520    475
>>>> 2010    5690    534
>>>>
>>>> I would like to calculate growth rates. What is the best (and simplest)
>>>statistical procedure to do that?
>>>>
>>>> Thank you,
>>>>
>>>> Lutz
>>>>
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