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BEBERAPA KONSEKUENSI SITUASI MEDIASI SEMPURNA PADA STRUKTUR KORELASI, KONTRIBUSI MEDIATOR, DAN UKURAN SAMPEL Suhardi, Deddy A; Isfarudi, Isfarudi
Jurnal Matematika Sains dan Teknologi Vol 11 No 1 (2010)
Publisher : LPPM Universitas Terbuka

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A very popular article by Baron and Kenny (1986), later extended by Kenny, Kashy, and Bolger (1998), recommended to social psychologists a test of mediation based on a set of steps involving correlations and regression weights. The serial published tests of mediation has come to be known as the Baron-Kenny approach. By the Baron-Kenny approach, a simple complete mediation is to be indicated which is a test of the direct path between an independent variable (X) and a dependent variable (Y) with a mediator variable (M) controlled is not significant. A simple mediation model has three correlations of their variables each. According to sequential regression analysis on a simple mediation model, a mediator M come after an independent variable X exist in the model, has a contribution of the mediator. Otherwise, sample size is a critical component to test as well as statistically significances. We argue the importance of investigating condition and interrelation of the three correlations, sequential contribution of the mediator, and sample size in the simple complete mediation cases by using hypotetical data generated by Microsoft Excel. We indicate some general consequences of simple complete mediation cases that are: (i) average of correlation XY is lower than average of correlation XM that lower than average of correlation MY; (ii) average contribution of mediator, indicated by R2 change, at interval of 23% up to 27%; (iii) distribution of effects X on Y when M controlled is influenced by sample size, the higher sample size, the lower distribution is; and (iv) average of mediation effects is at interval: 0.4 and above for levels of small sampel size (10 up to 40), between 0.2 and 0.4 for levels of medium sample size (50 up to 300), and under 0.2 for levels of large sample size (500 or above).  

TINGKAT PENGGUNAAN BAHAN KIMIA BERBAHAYA PADA PENGOLAHAN IKAN ASIN: KASUS DI MUARA ANGKE DAN CILINCING, JAKARTA Ernik Yuliana; Deddy Ahmad Suhardi; Adhi Susilo
Jurnal Pengolahan Hasil Perikanan Indonesia Vol 14 No 1 (2011): Jurnal Pengolahan Hasil Perikanan Indonesia
Publisher : Department of Aquatic Product Technology IPB University in collaboration with Masyarakat Pengolahan Hasil Perikanan Indonesia (MPHPI)

Salted  sh is still prefered by community of Indonesia. Salted  sh processing by traditional method depent on the intensity of sunlight. To reduce depence, some processors used chemicals as a preservative. The purpose of the study is identi ed the level of use of hazardous chemicals in salted the processing of salted  sh. The research’s design was explanatory research design. The population were all of the salted  sh processors in Muara Angke andCilincing, North Jakarta. Respondent choosen randomly to get 73 salted  sh processors, 55 persons of them were located at Muara Angke and another 18 were from Cilincing. Data collected consist of primary data, used survey methods. Then data was analysed with descriptif-analysis and Rank Spearman correlation. The results indicated that the hazardous chemicals (formalin and bleach) were still used by the processor. Level of usage hazardous chemicals is signi cantly associated with perception processors of consumer knowledge. Education of consumers about the hazardous chemicals needs to be improved so that consumers did not want to buy salted  sh products with chemicals, thereby to suppress the use of chemicals in the processing of salted  sh. Government oversight of the use of hazardous chemicals was still relatively low, so that should be improved to encourage processors to be willing to process naturally salted  sh and leave the chemicals.Keywords: chemicals, government oversight, salted  sh, salted  sh processor

PENERAPAN REGRESI LOGISTIK BINER UNTUK MENGUKUR RESIKO ANEMIA DENGAN STATUS GIZI IBU HAMIL Deddy A Suhardi; Ila Fadila
Jurnal Matematika Sains dan Teknologi Vol. 17 No. 1 (2016)
Publisher : LPPM Universitas Terbuka

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The prevalence of anaemia is an important health indicator for pregnant women. This paper demonstrates the use of logistic regression modelling techniques for an ordinal binary in terms of both response and predictor variables. By using 120 cross-sectional data to measure the attitude of pregnant women observed at three Community Healthcare Center (CHC) in the Serang District - Banten Province on September 2012, we investigated a factor predicting anaemia and tested whether changes in nutritional status were associated with changes in anaemia status. The anaemia status threshold using haemoglobin concentration (g/dl) was measured by the Cyanmethemoglobin method, and the nutritional status was categorized by measuring Upper Arm Circumference (cm). This paper discusses the roles of nutritional status determining the risks of anaemia and compares the results obtained using the contingency analytical methods. The paper also demonstrates how the logistic regression modelling approach dealing with the odds ratio statistic can better explain the risks of anaemia determined by nutritional status found in the CHC studied. We found that anaemia status is affected by nutritional status (coef. 1,07; p. 0,066), and the results of contingency analysis reveals that anaemia satus is associated with nutritional status (chi-sq. 3,60; p. 0,058). According to odds ratio statistic of the logistic regression (OR 2,92), the risks of anaemia on pregnant women with cronic energy deficiency would be 2,92times higher than they are on normal nutritions. Prevalensi anemia pada kehamilan merupakan salah satu indikator penting kesehatan ibu hamil. Paper ini membahas teknik regresi logistik untuk mengukur resiko anemia ibu hamil berdasarkan status gizinya. Rancangan model hanya terdiri dari satu variabel respon dan satu prediktor skala biner. Hasil analisis regresi logistik dibandingkan dengan analisis chi-kuadrat tabel kontingensi. Estimasi parameter regresi menggunakan data cross-sectional 120 ibu hamil yang diamati langsung dari tiga Puskesmas di Kabupaten Serang, Banten, pada September 2012. Status anemia dikategorikan dari pengukuran kadar hemoglobin (g/dl) menggunakan metode cyanmethemoglobin, sedangkan status gizi dari pengukuran pita lingkar lengan atas (cm). Analisis regresi logistik menunjukkan satus anemia dipengaruhi status gizi (koefisien regresi status gizi 1,07; odds ratio 2,92; p. 0,066). Analisis chi-kuadrat menunjukkan status anemia berhubungan dengan status gizi (chi-kuadrat 3,60; p. 0,058). Statistik odds ratiopada kasus ini mendeskripsikan sejauh mana peran status gizi menentukan resiko anemia ibu hamil. Resiko anemia 2,92 kali lebih tinggi bagi ibu hamil dengan kondisi gizi kurang energi kronik daripada ibu hamil dengan gizi baik.

EFEKTIVITAS VARIABEL MEDIATOR BERDASARKAN KONTRIBUSINYA DALAM MODEL MEDIASI SEDERHANA Deddy A Suhardi; Settings Isfarudi Isfarudi
Jurnal Matematika Sains dan Teknologi Vol. 10 No. 1 (2009)
Publisher : LPPM Universitas Terbuka

Structurally relationship of variables is important in deeply analysis of path models, but the process of effect distribution must be concerned. In this situation, one or more variable would be a mediator variable which assessing effect of an independent to a dependent variable. We studied the simple mediation model that is one of path analytical models which contain of one independent variable, dependent variable and mediator variable. A necessary component of mediation is effectiveness that is a statistically significant indirect effect, formal significance tests of indirect effects are early conducted by Sobel (1982). According to sequential regression analysis on a simple mediation model, a mediator variable come after an independent variable exist in the model, the contribution of upcoming variable to the model could be obtained. We argue the importance of investigating empirical relationship between the significance of indirect effects and sequential contribution of mediator variable with a normal theory approach using Microsoft Excel simulation tools developed by Myerson (2000). We find that the higher contribution of mediator variable to the model, the more effectiveness is. This result comes up with three level correlation of independent and dependent variable which each 1000 times iteration that gives relatively immediate information about the recent empirical relationship between the significance of indirect effects and sequential contribution of mediator in the simple mediation models.

STUDENT’S PERCEPTION ON TUTOR PERFORMANCE: A THREE SEMESTER STUDY Adhi Susilo; Deddy Ahmad Suhardi
Jurnal Pendidikan Terbuka Dan Jarak Jauh Vol. 16 No. 2 (2015)
Publisher : LPPM Universitas Terbuka

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Artikel ini menyajikan hasil studi selama tiga semester mengenai kepuasan mahasiswa dengan instruksi daring di Universitas Terbuka, Indonesia. Makalah ini membahas bagaimana kinerja tutor mempengaruhi persepsi mahasiswa dalam belajar secara daring. Penelitian ini mempelajari lebih jauh dari penelitian sebelumnya tentang kepuasan mahasiswa dengan e-learning. Peneliti melakukan serangkaian survei selama tiga semester. Empat puluh satu siswa berpartisipasi dalam studi ini. Secara keseluruhan, siswa menilai instruktur online sebagai cukup memuaskan. Tingkat kepuasan mahasiswa agribisnis dengan tutor online di UT terutama puas (63%). Lebih dari sembilan belas persen memiliki tingkat yang sangat puas. Berdasarkan analisis komponen utama, penelitian ini mengungkapkan enam struktur dari tingkat kepuasan dengan tutor online; (1) perantara diskusi (62,20%), (2) strategi tutorial (79,18%), (3) umpan balik pada pendapat siswa (84,69%), (4) tetap pada jadwal (89,12%), (5) membuat ringkasan (92,24%), dan (6) menyediakan bahan pembelajaran yang menarik (94,64%). This article presents the results of a three-semester study of undergraduate students’ level of satisfaction with online instruction at Universitas Terbuka, Indonesia. The paper discusses how tutor performance affect student’s perception of online learning.The study expands on earlier research into student satisfaction with e-learning. Researcher conducted a series of surveys over three academic semester. Forty-one students participated in the study. Responses were consistent throughout, although there were some differences noted in the level of student satisfaction with their experience. Overall, students rated their online instructor as moderately satisfactory.The satisfaction level of agribusiness students with online tutor at UTwas mainly satisfied (63%). More than nineteen percent had a very satisfied level.Based on principal component analysis, this study revealed six structures of satisfaction level with online tutor; (1) moderating discussion (62,20%), (2) tutorial strategy (79,18%), (3) feedback on student's opinion (84,69%), (4) keep on schedule (89,12%), (5) making summary (92,24%), and (6) providing attractive learning material (94,64%).

SURVEI KESIAPAN DAN KEPUASAN MAHASISWA TERHADAP LAYANAN PROSES PEMBELAJARAN DALAM JARINGAN UNIVERSITAS TERBUKA SAAT PANDEMIC COVID 19 Adhi Susilo; Ojat Darojat; Deddy Ahmad Suhardi
Jurnal Pendidikan Terbuka Dan Jarak Jauh Vol. 20 No. 2 (2019)
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33830/ptjj.v20i2.839.2019

During Covid-19 pandemic, online learning has been implemented as a strategic solution by many universities to prevent the spread of the Covid-19. This new teaching learning practice has encouraged researchers to conduct a survey of student readiness and satisfaction with the online learning services. This study aims to uncover two strategic issues including factors that influence student readiness and satisfaction and the level of student readiness and satisfaction dealing with online learning services. This research employs quantitative research methods using online surveys and involving all students who were actively registered in 2019 and 2020 both UT and non-UT students who participated in online learning services. Samples, however, were taken from all respondents covering western, central, and eastern Indonesia. It was discovered that structurally, supporting aspects contribute around 37%, prospect aspects 25%, benefit aspects 23%, and constraint aspects 11%, towards a dimension of the formation of participants' online learning perceptions. The findings show that participants have quite different views on supporting aspects, benefits, or prospects of online learning from the aspects of constraints. The relationship among the three distribution groups of variable categories shows three quite different positions in terms of participants' perceptions on online learning, namely accepting, moderate or opposing positions. Their opinion on online learning programs, during the Covid-19 outbreak, participants differed in their opposing positions on the one hand and moderate positions on the other, especially regarding costs, trends, and prices of devices/supporting equipment for online learning participants.

Peningkatan Kualitas Air Bersih di Daerah Berbukit: Desa Cikidang - Sukabumi dan Karangtengah – Cianjur Deddy A. Suhardi, Mulyatno, Syaeful Mikdar
Prosiding Konferensi Nasional Pengabdian Kepada Masyarakat dan Corporate Social Responsibility (PKM-CSR) Vol 1 (2018): Prosiding PKM-CSR Konferensi Nasional Pengabdian kepada Masyarakat dan Corporate Socia
Publisher : Asosiasi Sinergi Pengabdi dan Pemberdaya Indonesia (ASPPI)

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Akses kepada air bersih oleh masyarakat di daerah berbukit umumnya mengandalkan air hujan dan aliran air sungai, sangat kesulitan pada musim kemarau. Aliran air sungai (anak sungai) yang sampai di tempat penampungan atau kolam mengandung butiran lumpur, kotoran, atau komposit lain sehingga tampak keruh, kurang bersih, dan tidak layak minum. Suatu solusi peningkatan kualitas dan akses kepada air bersih adalah pembuatan sumur air bor tanah, namun memerlukan teknologi yang tepat dan sesuai dengan kondisi tanah. Tim pengabdian kepada masyarakat (PkM) dari dosen Universitas Terbuka (UT) melakukan kegiatan peningkatan kualitas dan akses kepada air bersih bagi masyarakat di Desa Cikidang, Sukabumi dan Desa Karangtengah, Cianjur. Kedua lokasi termasuk kawasan perbukitan dengan ketinggian rata-rata 500 m dpl. Tim PkM Dosen UT juga bekerja sama dengan masyarakat di lokasi membangun instalasi sumur air bor tanah untuk sarana umum air bersih. Hasil yang tampak dari kegiatan ini adalah tersedia sumber air bersih yang dapat diakses oleh masyarakat dan peningkatan pengetahuan masyarakat tentang kualitas air bersih, iptek sederhana sumur air bor tanah, serta edukasi norma hidup sehat, tertib, dan kooperatif bagi masyarakat. Metode intervensi kegiatan PkM adalah pendampingan dan penyuluhan kepada mitra, meliputi kegiatan survey dan koordinasi dengan mitra, pelaksanaan pengeboran dan instalasi, pengujian kelayakan dan kapasitas air, serta penyuluhan iptek air bersih. Sumur bor di Cikidang Sukabumi menggunakan mesin di atas tanah dengan kedalaman pipa sumur 25 meter dan menghasilkan air dengan debit rata-rata 25 liter per menit, sedangkan di Karangtengah Cianjur menggunakan mesin benam dengan pipa kedalaman 40 meter dan debit air rata-rata 33 liter per menit. Air yang dihasilkan memenuhi kriteria air bersih dan layak minum dengan kapasitas yang tetap dan melimpah.

Faktor-Faktor yang Mempengaruhi Resistensi Mahasiswa Fakultas Sains dan Teknologi Universitas Terbuka Lintang Patria; Sri Utami; Deddy A Suhardi; Heny Kurniawati; Dian Nursantika
Jurnal Pendidikan Terbuka Dan Jarak Jauh Vol. 23 No. 2 (2022)
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33830/ptjj.v23i2.3944.2022

Pandemi Covid-19 berdampak signifikan terhadap pembelajaran mahasiswa di perguruan tinggi. Adanya Covid-19 yang berdampak pada berbagai bidang kehidupan dapat mempengaruhi ketahanan mahasiswa untuk kuliah di UT. Selama ini strategi pembelajaran, faktor sosiodemografi, layanan tutorial, kemampuan akademik dan kepuasan mahasiswa terhadap layanan UT telah mempengaruhi resiliensi mahasiswa. Penelitian ini bertujuan untuk mengetahui faktor-faktor yang mempengaruhi daya tahan mahasiswa Universitas Terbuka selama masa pandemi COVID-19. Analisis data dilakukan dengan menggunakan Confirmatory Factor Analysis (CFA). Hasil penelitian ini menyatakan bahwa kondisi sosial ekonomi pada masa pandemi Covid 19 dan strategi pembelajaran berpengaruh signifikan terhadap resistensi registrasi mahasiswa. Tingkat resistensi (mahasiswa registrasi ulang) dipengaruhi oleh kemampuan mengatasi kendala sosial ekonomi pada masa pandemi (Sosvid, 0,49), kemampuan akademik (0,38), kondisi layanan UT (-0,16), layanan tutorial-praktikum (-0,20), dan strategi pembelajaran (-0,44). Keluaran dari penelitian ini adalah rekomendasi perbaikan dan inovasi layanan FST UT selama pandemi.

LIVESTOCK SELF-SUFFICIENCY AND LIVESTOCK HOUSEHOLD DISTRIBUTION IN INDONESIA: CURRENT STATE AND EXPECTED DEVELOPMENTS Adhi Susilo; Deddy Ahmad Suhardi
AgriDev Vol. 1 No. 1 (2022)
Publisher : LPPM Universitas Terbuka

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Indonesia has increasing demand for animal sources of food including red meat. There has always been a national gap between supply and demand of red meat. This paper aims to describe the current features and prospects for livestock production systems in Indonesia. The research method used is descriptive statistics. Based on the source, the data used in this study is secondary data from the Central Statistics Agency (BPS). The first part of the article reviews and analyses population of Indonesian livestock. The second part addresses issues related to the current distribution of livestock that could become important for future development of the livestock industry in Indonesia. Recommendations to improve distribution, to empower smallholder farmers, and to develop systems for livestock development are briefly discussed.

Kajian Pemanfaatan Fitur dan Fasilitas Moodle dan Office-365 untuk Peningkatan Kualitas Pembelajaran pada Tutorial Online Adhi Susilo; Deddy Ahmad Suhardi
Edcomtech: Jurnal Kajian Teknologi Pendidikan Vol. 3 No. 2 (2018)
Publisher : Universitas Negeri Malang in collaboration with APSTPI and IPTPI

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One of the main means to enhance student’s learning activities is by implementing technology in their learning activities. Nowadays, many universities in the world had applied this method due to many benefits that its offer. Universitas Terbuka (UT) is one of distance learning institution in Indonesia that had applied this method for its student. Therefore, this research intends to investigate the perceptions of students and tutors in utilizing the features and facilities of Office365 in online tutorial and online practicum. Furthermore, the perceptions of students and tutors that was analyzed include the use of standard applications contained in Moodle and their expectations in utilizing Office365 features and facilities for online tutorials and online practicum. This study employs online survey that consists of 11 items. The perception of student regarding the Office365 features is influenced by age, gender, education, online tutorial training, and online tutorial activities. The students’ responses of Office365 facilities are affected by age, gender, education, employment, training and online tutorial activities. Office365’s features and facilities are most likely to influence the effectiveness of the distance learning process since students have the opportunity to interact with their teachers, peers, and learning materials. Moreover, the Office365 enable student to access the material through this facility. The other benefit is the existence of forum that could be used as discussions means between student and lecturer. Hence we recommend that all online activities should be designed to achieve the optimization of distance learning such as strengthening the online tutorial and online practicum, improving the ICT competence of academic staff and their involvement in online tutorial and online practicum, improving services to all UT’s stakeholders and developing an upgrade of standard application training of Moodle and Office365

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