W powiecie tarczyńskim przeprowadzono badanie trzyosobowych gospodarstw domowych |
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na temat średnich miesiecznych wydatków na mleko i nabiał , Poniżej przedstawiono zestawuienie tych wydatków |
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w oparciu o dane z ostatniego miesiąca. Dodatkowo przyjęto, że wydatki na nabiał (Y) zależą od dochodów gospodarstw domowych (X w zł) |
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X |
Y |
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1/X |
1/Y |
1/X - śr 1/X |
(1/X - śr 1/X) * y |
(1/X - śr 1/X )^2 |
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1700 |
150 |
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0,000588235294118 |
0,006666666666667 |
0,00020409873162 |
1,36065821079701E-06 |
4,16562922487097E-08 |
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(a ze wzoru ) |
b/a |
2,54554491528575 |
2480 |
161,25 |
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0,000403225806452 |
0,006201550387597 |
1,90892439535173E-05 |
1,18382908238867E-07 |
3,64399234716896E-10 |
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(b ze wzoru) |
1/a |
0,005198803671915 |
2200 |
158,75 |
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0,000454545454545 |
0,006299212598425 |
7,04088920473589E-05 |
4,43520579825883E-07 |
4,95741207933664E-09 |
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1500 |
140 |
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0,000666666666667 |
0,007142857142857 |
0,000282530104169 |
2,01807217263265E-06 |
7,98232597615036E-08 |
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3200 |
166,25 |
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0,0003125 |
0,006015037593985 |
-7,16365624980956E-05 |
-4,30896616529898E-07 |
5,13179708654356E-09 |
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1/y = 0,0052/2,5455 + 1/2,5455 |
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2848 |
163,75 |
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0,000351123595506 |
0,006106870229008 |
-3,30129669924776E-05 |
-2,01605905297573E-07 |
1,08985598964642E-09 |
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2760 |
163,75 |
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0,00036231884058 |
0,006106870229008 |
-2,18177219183855E-05 |
-1,33237996448156E-07 |
4,76012989707997E-10 |
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1900 |
156,25 |
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0,000526315789474 |
0,0064 |
0,000142179226976 |
9,09947052643767E-07 |
2,02149325833759E-08 |
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4160 |
171,25 |
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0,000240384615385 |
0,005839416058394 |
-0,000143751947113 |
-8,39427428399885E-07 |
2,06646222989168E-08 |
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2500 |
161,25 |
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0,0004 |
0,006201550387597 |
1,58634375019044E-05 |
9,83779069885545E-08 |
2,51648649376827E-10 |
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2200 |
158,75 |
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0,000454545454545 |
0,006299212598425 |
7,04088920473589E-05 |
4,43520579825883E-07 |
4,95741207933664E-09 |
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4460 |
172,5 |
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0,000224215246637 |
0,005797101449275 |
-0,000159921315861 |
-9,27080091949706E-07 |
2,55748272668175E-08 |
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3200 |
166,25 |
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1/a = |
0,0051988 |
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0,0003125 |
0,006015037593985 |
-7,16365624980956E-05 |
-4,30896616529898E-07 |
5,13179708654356E-09 |
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2540 |
161,25 |
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a |
192,352081249519 |
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0,000393700787402 |
0,006201550387597 |
9,56422490347919E-06 |
5,93130226572353E-08 |
9,14743980043315E-11 |
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3580 |
168,75 |
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0,000279329608939 |
0,005925925925926 |
-0,00010480695356 |
-6,21078243315841E-07 |
1,09844975144333E-08 |
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3380 |
167,5 |
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b/a |
2,54554 |
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0,000295857988166 |
0,005970149253731 |
-8,82785743324151E-05 |
-5,27036264671135E-07 |
7,79310668616374E-09 |
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1880 |
155 |
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b= |
489,639916903901 |
bez interp. |
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Parametr b nie ma interpretacji. |
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0,000531914893617 |
0,006451612903226 |
0,000147778331119 |
9,53408587864037E-07 |
2,18384351482948E-08 |
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4200 |
171,25 |
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Miesięczne wydatki na mleko i nabiał w trzyosobowych gospodarstw domowych w powiecie tarczyńskim nie przekraczają 192zł 35gr |
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0,000238095238095 |
0,005839416058394 |
-0,000146041324403 |
-8,52796054907197E-07 |
2,13280684333407E-08 |
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3080 |
165,625 |
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0,000324675324675 |
0,006037735849057 |
-5,94612378227709E-05 |
-3,59011247231825E-07 |
3,53563880341612E-09 |
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3100 |
166,25 |
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0,000322580645161 |
0,006015037593985 |
-6,15559173368053E-05 |
-3,70261156913115E-07 |
3,78913095917561E-09 |
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0,000384136562498 |
0,006176640545357 |
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7,11873399279658E-07 |
2,79654621297361E-07 |
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Wiedząc, że popyt na nabiał można opisać za pomocą funkcji Tornquista I rodzaju proszę: |
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- oszacować parametry tej funkcji |
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- zinterpetować otrzymane estymatory parametów |
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c) |
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- obliczyć i zintepretować elastyczność popytu przy dochodach 2600 zł |
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161,904690548865 |
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Ex |
0,153036526928552 |
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Wzrost dochodu 3 osobowej rodziny w powiecie tarczyńskim spowoduje wzrost wydatków na mleko i nabiał o 0,153 |
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Niezbędne wzory: |
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1 rodzaju - artykuly pierwszej potrzeby |
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2 rodzaju - dla dobr i uslug wyzszego rzedu |
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3 rodzaju - dla dobr i uslug luksusowych |
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genr alpha = 192.3520812 |
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genr beta = 489.6399169 |
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nls Y = alpha * X/(beta + X) |
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deriv alpha = X/( beta + X) |
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deriv beta = - alpha * X / ( beta + X)^2 |
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Ostateczne parametry modelu przyjmą postać: |
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Miesięczne wydatki na mleko i nabiał w trzyosobowych gospodarstw domowych w powiecie tarczyńskim nie przekraczają 191zł 16gr |
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Wśró studentów SGGW przeprowadzono badanie wydatków na żywność w zależności od dochodów. |
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Przypuszcza się ,że modelowanie wydatków można przeprowadzić za pomocą funkcji Tornquista I rodzaju. |
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Proszę oszacować parametry modelu oraz podać interpretqację otrzymanych wyników. |
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Proszę wyznaczyć i zinterpreetować elastyczność popytu na żywność (modelowanego wydatkami) 1500 |
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Proszę podac interpretację otrzymanych wyników. |
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Kwota dochodów |
Wydatki na żywność |
X^-1 |
Y^-1 |
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1350 |
630 |
0,000740740740741 |
0,001587301587302 |
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1620 |
657 |
0,000617283950617 |
0,001522070015221 |
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2250 |
684 |
0,000444444444444 |
0,001461988304094 |
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1890 |
668 |
0,000529100529101 |
0,001497005988024 |
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1620 |
652 |
0,000617283950617 |
0,001533742331288 |
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1420 |
636 |
0,000704225352113 |
0,001572327044025 |
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1125 |
605 |
0,000888888888889 |
0,001652892561983 |
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1575 |
648 |
0,000634920634921 |
0,001543209876543 |
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2700 |
700 |
0,00037037037037 |
0,001428571428571 |
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1575 |
648 |
0,000634920634921 |
0,001543209876543 |
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1600 |
650 |
0,000625 |
0,001538461538462 |
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2300 |
700 |
0,000434782608696 |
0,001428571428571 |
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1400 |
650 |
0,000714285714286 |
0,001538461538462 |
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1600 |
650 |
0,000625 |
0,001538461538462 |
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2200 |
700 |
0,000454545454545 |
0,001428571428571 |
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PODSUMOWANIE - WYJŚCIE |
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Statystyki regresji |
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Wielokrotność R |
0,975169066439842 |
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R kwadrat |
0,950954708141153 |
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Dopasowany R kwadrat |
0,94718199338278 |
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Błąd standardowy |
1,45582834736325E-05 |
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Obserwacje |
15 |
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ANALIZA WARIANCJI |
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df |
SS |
MS |
F |
Istotność F |
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Regresja |
1 |
5,34227456935858E-08 |
5,34227456935858E-08 |
252,061120186911 |
6,83825153120762E-10 |
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Resztkowy |
13 |
2,75526703008233E-09 |
2,11943617698641E-10 |
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Razem |
14 |
5,61780127236681E-08 |
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Współczynniki |
Błąd standardowy |
t Stat |
Wartość-p |
Dolne 95% |
Górne 95% |
Dolne 95,0% |
Górne 95,0% |
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Przecięcie |
0,001248873052345 |
1,7547012060606E-05 |
71,1729750929558 |
3,09319286344262E-18 |
0,001210965037475 |
0,001286781067216 |
0,001210965037475 |
0,001286781067216 |
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1/a |
0,001248873052345 |
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a = |
800,72189733141 |
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Wydatki na żywność w zależności od dochodów nie przekraczają 800,72 |
Zmienna X 1 |
0,451731306488604 |
0,02845294724737 |
15,8764328546091 |
6,83825153120762E-10 |
0,390262451071397 |
0,513200161905812 |
0,390262451071397 |
0,513200161905812 |
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b/a |
0,451731306488604 |
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b = |
361,711148815552 |
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y = 800,7219 * x / (361,71 + x) |
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genr alpha = 192,3520812 |
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genr beta = 489,6399169 |
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nls Y = alpha * X/(beta + X) |
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deriv alpha = X/( beta + X) |
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deriv beta = - alpha * X / ( beta + X)^2 |
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Ostateczne parametry modelu przyjmą postać: |
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Wydatki na żywność w zależności od dochodów nie przekraczają 800,955 zł |
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c) |
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0,194473875982272 |
0,19% |
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Wzrost dochodu o 1% spowoduje wzrost wydatków na żywność o 0,19% |
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