Variasi Ketepatan Pengiriman Antarwilayah dan Moda Layanan dalam Rantai Pasok Global
Keywords:
ketepatan pengiriman, kelas layanan, variasi regional, standardisasi langsung, rantai pasokAbstract
Perbandingan ketepatan pengiriman antarwilayah dapat dipengaruhi komposisi kelas layanan dan perbedaan tenggat yang dijanjikan. Penelitian ini mengevaluasi variasi ketepatan pengiriman pada DataCo SMART Supply Chain versi 5 dengan membedakan kepatuhan tenggat dan durasi aktual tercatat. Sebanyak 180.519 baris produk diagregasi menjadi 65.752 pesanan; analisis utama mencakup 62.897 pesanan yang tidak dibatalkan pada Januari 2015–Januari 2018, meliputi 23 wilayah, empat kelas layanan, dan 20.261 pelanggan. Metode menggabungkan tabulasi pada tingkat pesanan, standardisasi langsung komposisi layanan, bootstrap berkelompok berdasarkan pelanggan sebanyak 2.000 replikasi, serta regresi logistik dengan kovarians berkelompok. Proporsi tidak terlambat adalah 42,69%, yang terdiri atas 24,05% pengiriman lebih awal dan 18,64% tepat pada tenggat. Standard Class mencapai kepatuhan 60,15%, Same Day 51,63%, Second Class 20,01%, dan First Class 0%. Seluruh First Class memiliki durasi dua hari terhadap tenggat satu hari, sehingga dikeluarkan dari estimasi logistik untuk menghindari pemisahan sempurna. Asosiasi deskriptif kelas layanan lebih besar daripada wilayah, dengan Cramér V masing-masing 0,4807 dan 0,0221. Rentang proporsi wilayah berubah dari 7,46 menjadi 8,40 poin persentase setelah standardisasi; peringkat Central Asia berubah dari ketujuh menjadi kedua puluh satu. Model pada 53.295 pesanan menunjukkan statistik Wald wilayah 20,84 dengan 22 derajat bebas dan p = 0,531. Hasil mendukung evaluasi layanan berdasarkan tenggat yang sebanding, tetapi belum menyediakan bukti kuat mengenai perbedaan regional setelah penyesuaian. Keterbatasan cakupan waktu, ukuran kelompok kecil, dan keteraturan durasi mengharuskan interpretasi sebagai karakteristik dataset historis, bukan penilaian kausal atas kualitas jaringan global.
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