Isu yang Diangkat
Perbedaan jenis kelamin, tingkat pendidikan, dan status pekerjaan merupakan isu strategis dalam penelitian sosial dan ketenagakerjaan. Ketiga variabel ini saling berkaitan secara kompleks dan tidak dapat dikaji secara terpisah.
Berbagai penelitian menunjukkan bahwa:
Diperlukan metode yang mampu mengkaji hubungan beberapa variabel kategorik secara simultan — inilah yang mendorong penggunaan Model Log-Linear Tiga Arah.
General Social Survey (GSS) 2024
Dikelola oleh NORC (National Opinion Research Center),
University of Chicago
🔗 https://gss.norc.org
Pengelompokan mengacu pada klasifikasi Bureau of Labor Statistics (BLS) Amerika Serikat
| Kelompok | Kategori Asli GSS |
|---|---|
| Rendah | Less than high school diploma; High school graduate |
| Menengah | Some college; Associate degree |
| Tinggi | Bachelor’s degree; Graduate degree |
Pengelompokan mengacu pada konsep International Labour Organization (ILO)
| Kelompok | Kategori Asli GSS |
|---|---|
| Bekerja | Working full time; Working part time; Temporarily not working |
| Menganggur | Unemployed, laid off |
| Bukan Angkatan Kerja | Retired; School; Keeping house |
Total responden: 3167
| Variabel | Kategori | Frekuensi | Persentase |
|---|---|---|---|
| Jenis Kelamin | Pria | 1418 | 44.8% |
| Wanita | 1749 | 55.2% | |
| Tingkat Pendidikan | Rendah | 1702 | 53.7% |
| Menengah | 286 | 9.0% | |
| Tinggi | 1179 | 37.2% | |
| Status Pekerjaan | Bekerja | 1829 | 57.7% |
| Menganggur | 167 | 5.3% | |
| Bukan Angkatan Kerja | 1171 | 37.0% |
| Jenis Kelamin | Rendah | Menengah | Tinggi | Total |
|---|---|---|---|---|
| Pria | 472 | 76 | 348 | 896 |
| Wanita | 417 | 114 | 402 | 933 |
| Total | 889 | 190 | 750 | 1829 |
| Jenis Kelamin | Rendah | Menengah | Tinggi | Total |
|---|---|---|---|---|
| Pria | 68 | 4 | 17 | 89 |
| Wanita | 60 | 6 | 12 | 78 |
| Total | 128 | 10 | 29 | 167 |
| Jenis Kelamin | Rendah | Menengah | Tinggi | Total |
|---|---|---|---|---|
| Pria | 241 | 31 | 161 | 433 |
| Wanita | 444 | 55 | 239 | 738 |
| Total | 685 | 86 | 400 | 1171 |
🔍 Pola Awal yang Terlihat: Wanita berpendidikan rendah yang berada di luar angkatan kerja jauh lebih banyak (444) dibanding pria (241). Hal ini mengindikasikan kemungkinan adanya asosiasi antara jenis kelamin dan status pekerjaan.
\[\log(\mu_{ijk}) = \lambda + \lambda_i^X + \lambda_j^Y + \lambda_k^Z + \lambda_{ij}^{XY} + \lambda_{ik}^{XZ} + \lambda_{jk}^{YZ} + \lambda_{ijk}^{XYZ}\]
| Simbol | Keterangan |
|---|---|
| \(\lambda\) | Efek rata-rata umum (skala log) |
| \(\lambda_i^X, \lambda_j^Y, \lambda_k^Z\) | Efek utama variabel X, Y, Z |
| \(\lambda_{ij}^{XY}, \lambda_{ik}^{XZ}, \lambda_{jk}^{YZ}\) | Asosiasi dua arah antar variabel |
| \(\lambda_{ijk}^{XYZ}\) | Interaksi tiga arah |
Berikut adalah ringkasan 5 jenis model log-linear yang diuji:
| Jenis Model | Generating Class | Interaksi yang Ada |
|---|---|---|
| Mutual Independence | [X][Y][Z] | Tidak ada |
| Partial Independence | [XY][Z], [XZ][Y], [YZ][X] | Satu interaksi dua arah |
| Conditional Independence | [XY][XZ], [XY][YZ], [XZ][YZ] | Dua interaksi dua arah |
| Homogeneous Association | [XY][XZ][YZ] | Semua interaksi dua arah (tanpa tiga arah) |
| Saturated | [XYZ] | Semua interaksi (termasuk tiga arah) |
| Model | G² | X² | df | p-value G² | AIC | BIC |
|---|---|---|---|---|---|---|
| [X][Y][Z] Mutual Independence | 135.0655 | 131.6089 | 12 | 0.0000 | 259.76 | 265.10 |
| [X][YZ] Partial Indep X | 65.2268 | 64.8332 | 8 | 0.0000 | 197.92 | 206.82 |
| [Y][XZ] Partial Indep Y | 87.8855 | 85.0869 | 10 | 0.0000 | 216.58 | 223.70 |
| [Z][XY] Partial Indep Z | 130.0439 | 127.4172 | 10 | 0.0000 | 258.74 | 265.86 |
| [XY][XZ] Cond Indep YZ|X | 82.8640 | 79.6363 | 8 | 0.0000 | 215.56 | 224.46 |
| [XY][YZ] Cond Indep XZ|Y | 60.2053 | 59.6533 | 6 | 0.0000 | 196.90 | 207.58 |
| [XZ][YZ] Cond Indep XY|Z | 18.0469 | 18.0073 | 6 | 0.0061 | 154.74 | 165.42 |
| [XY][XZ][YZ] Homogeneous Assoc | 11.1787 | 11.2156 | 4 | 0.0246 | 151.87 | 164.34 |
| [XYZ] Saturated | 0.0000 | 0.0000 | 0 | 1.0000 | 148.69 | 164.72 |
*Model Terpilih: Homogeneous Association [XY][XZ][YZ]**
Analysis of Deviance Table
Model 1: Freq ~ X_Sex * Y_Education + X_Sex * Z_WorkStatus + Y_Education *
Z_WorkStatus
Model 2: Freq ~ X_Sex * Y_Education * Z_WorkStatus
Resid. Df Resid. Dev Df Deviance Pr(>Chi)
1 4 11.179
2 0 0.000 4 11.179 0.02463 *
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
Meskipun model Saturated memiliki G² = 0, model ini tidak memberikan nilai tambah interpretasi karena seluruh interaksi (termasuk tiga arah) sudah dimasukkan. BIC Saturated (164.72) justru lebih besar dari Homogeneous Association (164.34), sehingga model Homogeneous Association lebih dipilih.
Pengujian dilakukan dengan membandingkan model penuh (Homogeneous Association) terhadap model yang menghilangkan satu interaksi:
\[\Delta G^2 = G^2(M_{reduced}) - G^2(M_{full})\]
| Interaksi yang Diuji | Model Reduced | ΔG² | Δdf | p-value | Keputusan |
|---|---|---|---|---|---|
| YZ: Pendidikan × Status Pekerjaan | [XY][XZ] tanpa YZ | 71.6853 | 4 | 0.0000 | Signifikan |
| XZ: Jenis Kelamin × Status Pekerjaan | [XY][YZ] tanpa XZ | 49.0266 | 2 | 0.0000 | Signifikan |
| XY: Jenis Kelamin × Pendidikan | [XZ][YZ] tanpa XY | 6.8682 | 2 | 0.0323 | Signifikan |
Seluruh interaksi dua arah signifikan pada taraf 5% (p-value < 0.05):
Call:
glm(formula = Freq ~ X_Sex * Y_Education + X_Sex * Z_WorkStatus +
Y_Education * Z_WorkStatus, family = poisson(link = "log"),
data = data_xyz)
Coefficients:
Estimate Std. Error z value
(Intercept) 6.11001 0.04473 136.591
X_SexFEMALE -0.02629 0.05999 -0.438
Y_EducationMiddle -1.72547 0.10941 -15.771
Y_EducationHigh -0.20887 0.06311 -3.309
Z_WorkStatusUnemployed -1.87166 0.12105 -15.461
Z_WorkStatusNot in Labor Force -0.54410 0.06726 -8.089
X_SexFEMALE:Y_EducationMiddle 0.34040 0.13215 2.576
X_SexFEMALE:Y_EducationHigh 0.07721 0.07747 0.997
X_SexFEMALE:Z_WorkStatusUnemployed -0.13951 0.16342 -0.854
X_SexFEMALE:Z_WorkStatusNot in Labor Force 0.50926 0.07699 6.614
Y_EducationMiddle:Z_WorkStatusUnemployed -0.99455 0.33824 -2.940
Y_EducationHigh:Z_WorkStatusUnemployed -1.31202 0.21159 -6.201
Y_EducationMiddle:Z_WorkStatusNot in Labor Force -0.57338 0.14061 -4.078
Y_EducationHigh:Z_WorkStatusNot in Labor Force -0.37754 0.08072 -4.677
Pr(>|z|)
(Intercept) < 2e-16 ***
X_SexFEMALE 0.661151
Y_EducationMiddle < 2e-16 ***
Y_EducationHigh 0.000935 ***
Z_WorkStatusUnemployed < 2e-16 ***
Z_WorkStatusNot in Labor Force 6.00e-16 ***
X_SexFEMALE:Y_EducationMiddle 0.009996 **
X_SexFEMALE:Y_EducationHigh 0.318913
X_SexFEMALE:Z_WorkStatusUnemployed 0.393296
X_SexFEMALE:Z_WorkStatusNot in Labor Force 3.73e-11 ***
Y_EducationMiddle:Z_WorkStatusUnemployed 0.003278 **
Y_EducationHigh:Z_WorkStatusUnemployed 5.61e-10 ***
Y_EducationMiddle:Z_WorkStatusNot in Labor Force 4.55e-05 ***
Y_EducationHigh:Z_WorkStatusNot in Labor Force 2.91e-06 ***
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
(Dispersion parameter for poisson family taken to be 1)
Null deviance: 2946.514 on 17 degrees of freedom
Residual deviance: 11.179 on 4 degrees of freedom
AIC: 151.87
Number of Fisher Scoring iterations: 4
| Estimate | Std. Error | z value | Pr(>|z|) | Sig. | |
|---|---|---|---|---|---|
| (Intercept) | 6.1100 | 0.0447 | 136.5914 | 0.0000 | *** |
| X_SexFEMALE | -0.0263 | 0.0600 | -0.4383 | 0.6612 | |
| Y_EducationMiddle | -1.7255 | 0.1094 | -15.7706 | 0.0000 | *** |
| Y_EducationHigh | -0.2089 | 0.0631 | -3.3094 | 0.0009 | *** |
| Z_WorkStatusUnemployed | -1.8717 | 0.1211 | -15.4614 | 0.0000 | *** |
| Z_WorkStatusNot in Labor Force | -0.5441 | 0.0673 | -8.0894 | 0.0000 | *** |
| X_SexFEMALE:Y_EducationMiddle | 0.3404 | 0.1321 | 2.5760 | 0.0100 |
|
| X_SexFEMALE:Y_EducationHigh | 0.0772 | 0.0775 | 0.9967 | 0.3189 | |
| X_SexFEMALE:Z_WorkStatusUnemployed | -0.1395 | 0.1634 | -0.8537 | 0.3933 | |
| X_SexFEMALE:Z_WorkStatusNot in Labor Force | 0.5093 | 0.0770 | 6.6143 | 0.0000 | *** |
| Y_EducationMiddle:Z_WorkStatusUnemployed | -0.9945 | 0.3382 | -2.9404 | 0.0033 | ** |
| Y_EducationHigh:Z_WorkStatusUnemployed | -1.3120 | 0.2116 | -6.2009 | 0.0000 | *** |
| Y_EducationMiddle:Z_WorkStatusNot in Labor Force | -0.5734 | 0.1406 | -4.0776 | 0.0000 | *** |
| Y_EducationHigh:Z_WorkStatusNot in Labor Force | -0.3775 | 0.0807 | -4.6773 | 0.0000 | *** |
| Jenis Kelamin | Pendidikan | Status Pekerjaan | Observed | Fitted | Pearson Res. | Std. Res. | Dev. Res. |
|---|---|---|---|---|---|---|---|
| MALE | Low | Employed | 472 | 450.3434 | 1.0205 | 3.2453 | 1.0125 |
| MALE | Low | Unemployed | 68 | 69.2935 | -0.1554 | -0.4841 | -0.1559 |
| MALE | Low | Not in Labor Force | 241 | 261.3631 | -1.2596 | -3.1202 | -1.2765 |
| MALE | Middle | Employed | 76 | 80.2012 | -0.4691 | -1.1566 | -0.4733 |
| MALE | Middle | Unemployed | 4 | 4.5646 | -0.2643 | -0.3771 | -0.2700 |
| MALE | Middle | Not in Labor Force | 31 | 26.2342 | 0.9305 | 1.3611 | 0.9042 |
| MALE | High | Employed | 348 | 365.4554 | -0.9131 | -2.7077 | -0.9205 |
| MALE | High | Unemployed | 17 | 15.1419 | 0.4775 | 0.7736 | 0.4682 |
| MALE | High | Not in Labor Force | 161 | 145.4027 | 1.2935 | 2.4679 | 1.2713 |
| FEMALE | Low | Employed | 417 | 438.6566 | -1.0340 | -3.2453 | -1.0427 |
| FEMALE | Low | Unemployed | 60 | 58.7065 | 0.1688 | 0.4841 | 0.1682 |
| FEMALE | Low | Not in Labor Force | 444 | 423.6369 | 0.9893 | 3.1202 | 0.9816 |
| FEMALE | Middle | Employed | 114 | 109.7988 | 0.4009 | 1.1566 | 0.3984 |
| FEMALE | Middle | Unemployed | 6 | 5.4354 | 0.2422 | 0.3771 | 0.2382 |
| FEMALE | Middle | Not in Labor Force | 55 | 59.7658 | -0.6165 | -1.3611 | -0.6249 |
| FEMALE | High | Employed | 402 | 384.5446 | 0.8901 | 2.7077 | 0.8835 |
| FEMALE | High | Unemployed | 12 | 13.8581 | -0.4991 | -0.7736 | -0.5110 |
| FEMALE | High | Not in Labor Force | 239 | 254.5973 | -0.9775 | -2.4679 | -0.9878 |
| Jenis Kelamin | Pendidikan | Status Pekerjaan | Observed | Fitted | Pearson Res. | Std. Res. | Dev. Res. | |
|---|---|---|---|---|---|---|---|---|
| 1 | MALE | Low | Employed | 472 | 450.3434 | 1.0205 | 3.2453 | 1.0125 |
| 3 | MALE | Low | Not in Labor Force | 241 | 261.3631 | -1.2596 | -3.1202 | -1.2765 |
| 10 | FEMALE | Low | Employed | 417 | 438.6566 | -1.0340 | -3.2453 | -1.0427 |
| 12 | FEMALE | Low | Not in Labor Force | 444 | 423.6369 | 0.9893 | 3.1202 | 0.9816 |
Empat sel dengan residual besar semuanya berasal dari kelompok berpendidikan rendah, mengindikasikan bahwa model masih memiliki penyimpangan terbesar pada kelompok ini. Namun jumlahnya sangat sedikit (4 dari 18 sel), sehingga model masih dianggap memadai.
1. Model Terpilih: Homogeneous Association
[XY][XZ][YZ]
Dipilih berdasarkan nilai BIC terkecil (164.34) dan kemampuannya
merepresentasikan seluruh interaksi dua arah secara parsimonious.
2. Semua Interaksi Dua Arah Signifikan (α = 5%)
| Interaksi | ΔG² | Kekuatan |
|---|---|---|
| Pendidikan × Status Pekerjaan | 71.6853 | Terkuat |
| Jenis Kelamin × Status Pekerjaan | 49.0266 | Kuat |
| Jenis Kelamin × Pendidikan | 6.8682 | Signifikan |
3. Interpretasi Substantif - Individu berpendidikan lebih tinggi memiliki peluang lebih besar untuk bekerja - Terdapat perbedaan kondisi ketenagakerjaan antara pria dan wanita - Terdapat perbedaan distribusi tingkat pendidikan antara pria dan wanita
Implikasi Kebijakan: Jenis kelamin dan tingkat pendidikan harus dipertimbangkan secara bersamaan dalam merancang kebijakan ketenagakerjaan, karena keduanya secara signifikan berkaitan dengan kondisi pekerjaan seseorang.
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