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# RE: st: egen anycount

 From Thomas Speidel <[email protected]> To <[email protected]> Subject RE: st: egen anycount Date Tue, 24 May 2011 09:47:00 -0600

Nick, these values represent metabolic equivalent (MET) which is a measure of energy consumption. http://en.wikipedia.org/wiki/Metabolic_equivalent In this context I need to separate sedentary activities (</=1.5MET) from non-sedentary activities (>1.5MET)
```
Thomas

```
On Thu, 19 May 2011 13:21:48 +0100, Nick Cox <[email protected]> wrote:
```I would advise circumspection here.

First off, wanting to know if something is equal to one of 1.2, 0.8,
1.5 sounds an unusual kind of problem and it would be interesting to
know the context. For example, if these are codes in some
```
classification system, you might be better off holding the variable as
```string or mapped to integers with value labels.

Second, Daniel's hack solves one problem only to create another. The
```
code looks OK for -float- variables but for -double- variables it will
```often give the wrong answer. This can be seen directly with the
examples given:

. di 1.2 == float(1.2)
0

. di 0.8 == float(0.8)
0

. di 1.5 == float(1.5)
1

1.5 _can_ be held as an exact binary in both -float- and -double-,
but most decimals can't. So, Daniel's program wouldn't catch 1.2 or
0.8 in a -double- variable.

The bug is fixable and would require a branch in which a call
-float()- was not used if the variable was -double-.

On the whole, comparisons with decimals are best avoided, so seeking
work-arounds is, in my view, not a good strategy. For every program
like _ganycount where the file is short and a user-programmer is
willing to show you how to change it, there are many more where the
opposite is true.

Nick
[email protected]

daniel klein

I am not aware of a command, but it should not be hard changing the
existing -anycount-. Here's an ad hoc step-by-step

1. locate -anycount- and open it in the do-file editor

. doedit "`r(fn)'"

2. change the file (don't save the changes yet)

2.1 change line 2 form

"program define _ganycount"
to
"program define _ganycount2"

2.2 change line 7 from

"[...] , Values(numlist int) /*"
to
"[...] ,Values(numlist) /*"

2.3 change line 26 from

"*/ if ``i'' == `nj' & `touse'"
to
*/ if ``i'' == float(`nj') & `touse'

(to locate type: -di c(sysdir_personal)-) or alternatively to your
"plus/_/" folder (locate: -di c(sysdir_personal)-)

. egen somevar = anycount2(varlist), values(1.2 0.8 1.5)

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```
```
--
Thomas Speidel
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```