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Re: st: Numbers with decimals and -float- command


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Numbers with decimals and -float- command
Date   Tue, 8 Nov 2011 19:26:23 +0000

I found this difficult to follow. It's not clear that we need to
understand "upwards", "downwards" and "sideways", as the key question
is whether or not certain values are equal.

First note that the FAQ you cite is due to Jeremy Wernow.

You are puzzled why your -if- condition ignores e.g. observation 1870
in which you have

 1870.     2.325      2.325      2.525          .        .      2.525

and so on the face of should we be because (e.g.) the first and second
values look identical. But that is just a matter of display format.

As those variables are of the same type I would just look directly at
those values

assert  totsh1 == totsh2 in 1870
di %21x (totsh1[1870] - totsh2[1870])

I don't see that the -float()- function will be illuminating here.

Nick

On Mon, Nov 7, 2011 at 7:47 PM, Joseph Monte <hmjc66@gmail.com> wrote:

> The output below should contain only observations where there are both
> upwards and downwards (or vice versa) movements in "totsh" (from
> "totsh1" through "totsho~r"). Sideways movements are allowed. As an
> example, obs 1157 has a downward movement from "totsh1" to "totsh2"
> then upward to "totsh3" and then sideways to "totsho~r", which is
> fine. "obs" is the number of "totsh*" observations in each row.
>
> However, notice observations 1870 (where the path is upward and NOT
> downward) & 3275 (where the path is downward and NOT upward). These
> observations should not be in type 3 but in type 1 (which captures
> upward (and sideways) movements) and type 2 (which captures downward
> (and sideways) movements respectively) - these are not shown for
> brevity. On further investigation, I expected the issue to be resolved
> if I used the -float- command from Nick's FAQ.
>
> http://www.stata.com/support/faqs/data/float.html
>
> However, as shown below, the -float- command does not seem to solve
> the problem. In obs 1870, totsh1 & totsh2 do not seem to be equal even
> though both are 2.325. Same issue for obs 3275.
>
>
> . list totsh1 totsh2 totsh3 totsh4 totsh5 totshoffer obs type if type==3
>
>      +----------------------------------------------------------------------------+
>      |   totsh1     totsh2     totsh3     totsh4   totsh5   totsho~r
>  obs   type |
>      |----------------------------------------------------------------------------|
> 1157. |      3.5   3.483289        3.5          .        .        3.5
>   4      3 |
> 1362. | 1.615159   1.588584          .          .        .          2
>   3      3 |
> 1543. |      1.5          2          .          .        .       1.75
>   3      3 |
> 1691. |       20         25         21         15        .         15
>   5      3 |
> 1762. |     1.75        1.9          .          .        .      1.865
>   3      3 |
>      |----------------------------------------------------------------------------|
> 1764. | 1.785918    1.68277          .          .        .        2.4
>   3      3 |
> 1768. |     2.25          2          .          .        .   2.666667
>   3      3 |
> 1771. |      2.5        2.5          3          .        .        2.9
>   4      3 |
> 1774. |      5.5          4        4.7       4.65     4.65       4.65
>   6      3 |
> 1870. |    2.325      2.325      2.525          .        .      2.525
>   4      3 |
>      |----------------------------------------------------------------------------|
> 2115. |    2.475       2.14        2.4          .        .        2.4
>   4      3 |
> 2256. |      2.1       1.85          .          .        .        2.1
>   3      3 |
> 2514. |      2.5       2.75          .          .        .        2.4
>   3      3 |
> 2524. |        4        2.7        2.2          2        .        2.2
>   5      3 |
> 2598. |      2.5          2       2.35          .        .        2.5
>   4      3 |
>      |----------------------------------------------------------------------------|
> 2606. |      3.7       2.75          .          .        .       2.85
>   3      3 |
> 2645. |      3.4        2.3        3.3          .        .          3
>   4      3 |
> 2657. |      2.3        2.5        2.1       1.65        .       1.65
>   5      3 |
> 2719. |      2.5   2.949862          .          .        .        2.5
>   3      3 |
> 2737. |        2        1.5          .          .        .        1.7
>   3      3 |
>      |----------------------------------------------------------------------------|
> 2760. |        1        1.2         .9          .        .         .9
>   4      3 |
> 2782. |     2.25          2          .          .        .        2.5
>   3      3 |
> 2838. |    5.883          4          .          .        .        4.8
>   3      3 |
> 2912. |        2      2.455        1.8          .        .        1.8
>   4      3 |
> 2962. |     1.15          1       1.05          .        .       1.05
>   4      3 |
>      |----------------------------------------------------------------------------|
> 2980. |      2.7          2        2.3          .        .        2.3
>   4      3 |
> 2987. |        2        1.4        1.6          .        .       1.92
>   4      3 |
> 3027. |     5.45       5.55       5.65      5.553        .      5.553
>   5      3 |
> 3096. |      1.8       1.85       1.25       1.35        .       1.35
>   5      3 |
> 3132. |      1.5          1       1.25          .        .       1.25
>   4      3 |
>      |----------------------------------------------------------------------------|
> 3188. |      2.3        2.7          .          .        .        2.3
>   3      3 |
> 3251. |     17.2          6          .          .        .          7
>   3      3 |
> 3275. |      6.8        6.8          5          .        .          5
>   4      3 |
> 3286. |      1.8        1.4        1.5          .        .        1.5
>   4      3 |
> 3306. |        6          4          5          .        .          5
>   4      3 |
>      |----------------------------------------------------------------------------|
> 3488. |      2.5        2.2        2.5          .        .        2.5
>   4      3 |
> 3519. |    16.25      13.25       13.3       14.9        .       14.9
>   5      3 |
> 3566. |   12.575       10.5          5     4.0625        .      4.665
>   5      3 |
> 3667. |      3.5          4        3.6          .        .        3.6
>   4      3 |
> 3877. |     6.25        5.5        6.5          .        .        6.5
>   4      3 |
>      |----------------------------------------------------------------------------|
> 3919. |        8       11.5        8.5          .        .        8.5
>   4      3 |
> 3944. |      7.5        4.7          .          .        .          5
>   3      3 |
> 3954. |        6          5          .          .        .       6.44
>   3      3 |
> 4002. |     10.3       14.6         10          .        .         10
>   4      3 |
> 4014. |        5       4.95   5.030305   5.045972        .   5.295972
>   5      3 |
>      +----------------------------------------------------------------------------+
>
> . list totsh1 totsh2 type if float(totsh1)==float(totsh2) & totsh1!=. & type==3
>
>      +------------------------+
>      | totsh1   totsh2   type |
>      |------------------------|
> 1771. |    2.5      2.5      3 |
>      +------------------------+
>
> . des totsh1 totsh2
>
>              storage  display     value
> variable name   type   format      label      variable label
> ---------------------------------------------------------------------------------------------------------------------------------------------
> totsh1          float  %9.0g
> totsh2          float  %9.0g
>
>
> I would appreciate any help on the issue. I am using Stata 12.

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