Pooling data

[filippo dare]

Hi everyone. I have a question on how pooling data in stata. I am working with a repeated cross-section with observations coming from different groups of people and periods. Between subsequent periods I have treatments. Untill now I considered separately each pair of periods (1-2 2-4 4-5 5-6), thus I estimated 4 regression results. Now I would like to pool the results, that is I would like to have one unique regression outcome and not four. I have two problems. First, period 2 for example is post treatment respect period 1, but it is pre-treatment respect period 4. Second, I need to have pre and post treatment for each group. That is for example I can keep group4 in period 5 when I compare it to period 4, but not when I compare with period 6, because group4 is missing in 6. Is there any to pool data. Thanks for the attention.


periods
Group | 1 2 4 5 6 | Total
---------------+-------------------------------------------------------+----------
group 1 | 85 51 291 189 47 | 663
group 2 | 210 195 18 477 360 | 1,260
group 3 | 246 117 14 117 69 | 563
group 4 | 5 194 18 8 0 | 225
group 5 | 102 54 62 111 75 | 404
group 6 | 91 136 88 119 135 | 569
group 7 | 253 289 295 159 164 | 1,160
group 8 | 197 352 259 401 364 | 1,573
group 9 | 123 108 0 0 0 | 231
group 10 | 108 166 300 145 37 | 756
group 11 | 293 298 354 370 373 | 1,688
group 12 | 89 4 0 61 23 | 177
group 13 | 0 185 237 185 87 | 694
group 14 | 0 226 17 0 0 | 243
group 15 | 0 0 0 104 75 | 179
group 16 | 0 0 146 141 150 | 437
group 17 | 0 0 15 205 359 | 579
---------------+-------------------------------------------------------+----------

[filippo dare]

I attached a word-file with the table since I realized that the psted table is not clear

[Carlo Lazzaro]

Filippo:
as per FAQ the most fruitful way to share an excerpt/example of your data is via -dataex-.
Please also note that, as per FAQ again, screenshots and attatchments should be avoided.

[filippo dare]

Dear Carlo, thnaks for the advice. It is better in this way?

* Example generated by -dataex-. To install: ssc install dataex
clear
input byte group float periods
11 5
11 5
11 1
11 4
11 5
11 1
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11 5
11 4
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11 1
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11 4
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11 2
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11 1
11 1
11 1
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12 6
12 2
12 6
12 6
12 5
12 1
12 5
12 5
12 6
12 6
12 1
12 2
12 1
12 2
12 2
12 5
12 5
12 5
12 4
12 1
12 5
12 1
12 5
12 5
12 5
12 6
12 1
13 2
13 5
13 6
13 2
13 5
13 6
13 5
13 1
13 1
13 2
13 4
13 1
13 5
13 1
13 1
13 2
13 2
13 1
13 5
13 1
13 5
13 6
13 6
13 1
13 5
13 1
13 1
13 6
13 1
13 1
13 6
13 5
13 1
13 5
13 6
13 1
13 1
13 1
13 1
13 1
13 5
13 1
13 2
13 1
13 5
13 5
13 2
13 2
13 1
13 5
13 1
13 5
13 2
13 1
13 1
13 1
13 1
13 1
13 2
13 5
13 6
13 2
13 2
13 1
13 1
13 1
13 2
13 2
13 1
13 2
13 6
13 4
13 5
13 5
13 6
13 2
13 1
13 5
13 1
13 2
13 1
13 5
13 1
13 1
13 5
13 6
13 5
13 1
13 5
13 6
13 1
13 2
13 1
13 2
13 6
13 1
13 1
13 5
13 5
13 6
13 1
13 4
13 5
13 5
13 5
13 2
13 1
13 6
13 1
13 5
13 5
13 2
13 2
13 1
13 1
13 6
13 1
13 6
13 6
13 4
13 4
13 1
13 1
13 2
13 2
13 2
13 5
13 1
13 5
13 1
13 1
13 2
13 1
13 1
13 1
13 5
13 1
13 2
13 1
13 1
13 1
13 1
13 5
13 1
13 2
13 1
13 1
13 5
13 1
13 5
13 5
13 5
13 1
13 6
13 5
13 2
13 6
13 2
13 1
13 1
13 1
13 1
13 6
13 1
13 2
13 1
13 1
13 5
13 1
13 6
13 1
13 5
13 1
13 4
13 2
13 5
13 5
13 5
13 1
13 1
13 5
13 1
13 4
13 5
13 5
13 5
13 6
13 1
13 2
13 5
13 2
13 2
13 2
13 5
13 1
13 6
13 6
13 2
13 2
13 1
13 1
13 1
13 1
13 5
13 2
13 2
13 2
13 1
13 1
13 5
13 2
13 2
13 1
13 6
13 1
13 2
13 1
13 6
13 6
13 1
13 1
13 1
13 2
13 1
13 2
13 1
13 2
13 6
13 5
13 1
13 5
13 1
13 1
13 2
13 2
13 1
13 1
13 1
13 1
13 1
13 5
13 5
13 5
13 2
13 4
13 6
13 1
13 1
13 2
13 2
13 1
13 5
13 1
13 2
13 5
13 2
13 6
13 1
13 2
13 1
13 1
13 2
13 1
13 4
13 5
13 1
13 6
13 6
13 1
13 2
13 1
13 1
13 2
13 1
13 5
13 2
13 5
13 6
13 1
13 5
13 1
13 1
13 2
13 1
13 5
13 5
13 1
13 1
13 5
13 1
13 1
13 1
13 6
13 6
13 6
13 1
13 5
13 1
13 6
13 2
13 6
13 2
13 5
13 1
13 5
13 1
13 6
13 1
13 2
13 5
13 5
13 5
13 2
13 5
13 1
13 1
13 5
13 1
13 6
13 1
13 1
13 2
13 1
13 1
13 6
13 1
13 2
13 5
13 1
13 2
13 1
13 1
13 4
13 1
13 5
13 2
13 1
13 5
13 2
13 2
13 1
13 1
13 1
13 1
13 1
13 6
13 2
13 1
13 5
13 2
13 6
13 1
13 1
13 6
13 1
13 1
13 1
13 1
13 2
13 2
13 1
13 1
13 1
13 5
13 2
13 5
13 1
13 2
13 1
13 1
13 1
13 1
13 5
13 5
13 1
13 1
13 5
13 1
13 1
13 1
13 5
13 1
13 1
13 6
13 1
13 6
13 6
13 2
13 6
13 1
13 6
13 1
13 1
13 5
13 6
13 1
13 2
13 1
13 1
13 6
13 5
13 1
13 1
13 1
13 1
13 1
13 1
13 1
13 1
13 1
13 6
13 5
13 2
13 5
13 5
13 6
13 2
13 4
13 1
13 1
13 2
13 2
13 1
13 6
13 5
13 2
13 2
13 1
13 1
13 1
13 2
13 5
13 1
13 1
13 2
13 5
13 6
13 1
13 5
13 1
13 2
13 2
13 1
13 6
13 1
13 1
13 1
13 2
13 1
13 2
13 2
13 1
13 2
13 1
13 5
13 6
13 1
13 2
13 1
13 6
13 4
13 5
13 1
13 6
13 2
13 1
13 2
13 1
13 1
13 2
13 2
13 5
13 1
13 5
13 1
13 6
13 5
13 1
13 5
13 2
13 1
13 1
13 5
13 2
13 5
13 6
13 6
13 5
13 1
13 2
13 1
13 2
13 5
13 4
13 5
13 5
13 5
13 1
13 1
13 2
13 5
13 1
13 1
13 2
13 5
13 1
13 6
13 6
13 5
13 1
13 2
13 1
13 5
13 2
13 2
13 2
13 6
13 2
13 2
13 1
13 1
13 5
13 1
13 5
13 1
13 1
13 2
13 1
13 1
13 2
13 5
13 1
13 1
13 2
13 2
13 1
13 1
13 1
13 5
13 1
13 6
13 5
13 1
13 1
13 2
13 1
13 1
13 1
13 1
13 1
13 2
13 2
13 6
13 1
13 1
13 5
13 6
13 1
13 2
13 1
13 5
13 4
13 5
14 2
14 2
14 1
14 2
14 2
14 2
14 1
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 5
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 5
14 4
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 5
14 2
14 2
14 4
14 4
14 2
14 2
14 4
14 2
14 1
14 2
14 2
14 4
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 4
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 4
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 4
14 2
14 2
14 2
14 2
14 2
14 2
14 4
14 2
14 2
14 2
14 5
14 2
14 2
14 2
14 2
14 2
14 4
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 4
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 4
14 2
14 2
14 2
14 2
14 1
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 4
14 2
14 5
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 5
14 2
14 2
14 5
14 2
14 2
14 2
14 2
14 2
14 2
14 5
14 2
14 2
14 2
14 4
14 4
14 2
14 2
14 2
14 2
14 2
14 4
14 2
14 2
14 2
14 2
14 4
14 2
14 2
14 2
14 2
14 2
14 4
14 2
14 2
14 2
14 2
14 2
14 2
14 2
14 1
end
label values group country
label def country 11 "Austria", modify
label def country 12 "Germany", modify
label def country 13 "Sweden", modify
label def country 14 "Netherlands", modify

tab group periods

[Carlo Lazzaro]

Filippo:
as far as I can see, the design of your study sounds abit weird to me.
Perhaps you can interact -group- with -periods- (see -fvvarlist- options for further details):

i.group##i.periods

.