Judul: Analysis Factor of The Effect of Changes in  Stock Prices Using Panel Data Regression
Abstrak: Saham merupakan salah satu instrumen pasar keuangan yang paling populer. Menerbitkan saham merupakan salah satu pilihan perusahaan ketika memutuskan untuk pendanaan perusahaan. Dalam karya ilmiah ini diteliti seberapa besar pengaruh rasio harga penghasilan dan rasio hutang terhadap harga saham yang beredar untuk emiten tertua di Bursa Efek Indonesia. Data yang digunakan merupakan data panel dari 7 perusahaan penerbit saham tertua di Bursa Efek Indonesia dengan rentang waktu harga saham yang diambil mulai dari 2016 hingga 2021. Peramalan harga saham ini akan dimodelkan menggunakan regresi data panel yang mempunyai 3 model yaitu model pengaruh gabungan, model pengaruh tetap individu, dan model pengaruh acak. Dari hasil penelitian didapatkan bahwa model pengaruh tetap individu dengan transformasi data adalah model yang terbaik untuk digunakan. Model tersebut menggambarkan pengaruh rasio harga penghasilan dan rasio hutang terhadap harga saham emiten tertua di Bursa Efek Indonesia memiliki nilai R square sebesar 97.56% dengan nilai MAPE dari model sebesar 1.94% dan nilai MAPE peramalan sebesar 5.20%., Stocks are one of the most popular financial market instruments. Issuing shares is one of the company's choices when deciding to fund the company. This scientific paper will examine how much price earnings ratio and debt ratio influence the stock prices outstanding for the oldest issuers on the Indonesia Stock Exchange. The data used is panel data from the seven oldest stock issuing companies on the Indonesia Stock Exchange with a time range of stock prices from 2016 to 2021. This stock price forecasting will be modeled using panel data regression, which has three models: the common effect model, the individual fixed effect model, and the random effect model. The study’s results found that the fixed effect model with data transformation is the best model to use. The model illustrates the influence of the price-earnings ratio and debt ratio on the stock price of the oldest issuer in IDX which has R square value of 97.56% with MAPE of model 1.94% and MAPE of forecasting 5.20%.
Keyword: stock, regression, panel data, price-earning ratio, debt ratio

Judul: The Effect of Debt to Equity Ratio and Price to Book  Value on Stock Prices
Abstrak: Pengaruh laporan keuangan suatu perusahaan tehadap harga sahamnya tidak selalu sama, sehingga menjadi masalah bagi investor untuk mengetahui saham yang bagaimana yang layak untuk dibeli. Penelitian ini bertujuan untuk mengetahui dan menjelaskan pengaruh Debt to Equity Ratio (DER) dan Price to Book Value (PBV) baik secara simultan maupun secara parsial terhadap harga saham. Pemilihan sampel yang digunakan adalah enam perusahan semen yang sudah tercatat sebagai emiten di Bursa Efek Indonesia (BEI) periode 2016 hingga 2018 dan mengeluarkan laporan keuangan secara berkala setiap tahunnya. Variabel independen yang digunakan dalam penelitian ini ada dua yaitu Debt to Equity Ratio dan Price to Book Value, sedangkan untuk variabel dependen yang adalah harga saham. Penelitian ini menggunakan model analisis regresi linier berganda. Hasil penelitian menunjukkan bahwa variabel Debt to Equity Ratio dan Price to Book Value berpengaruh signifikan negatif terhadap harga saham. Hal ini berarti jika DER dan PBV semakin tinggi, maka harga saham akan semakin rendah., The effect of a company’s financial statements on its stock prices is not always the same, so it becomes a problem for investors to find out which stocks are worth buying. This study aims to determine and explain the effect of Debt to Equity Ratio (DER) and Price to Book Value (PBV) either simultaneously or partially on stock prices. The data used are stock prices of six cement companies that have been listed as issuers on the Indonesia Stock Exchange (IDX) for the period 2016 to 2018 and issue financial reports regularly every year. There are two independent variables used in this study, namely Debt to Equity Ratio and Price to Book Value, while the dependent variable used in this study is stock price. This research uses multiple linear regression analysis model. The results showed that the Debt to Equity Ratio and Price to Book Value variables had a significant negative effect on stock prices. It means if DER and PBV are higher, then the stock price will be lower.
Keyword: debt to equity ratio, price to book value, stock price

Judul: Sintesis Flavonol melalui 2’-Hidroksikalkon
Abstrak: Flavonol is a class of flavonoids commonly found in fruits and vegetables. Flavonol is very useful, especially in food sector and health. In this study, flavonol unsubstituted was successfully synthesized from an intermediate material 2’-hydroxychalcone. The 2’-hydroxychalcone was synthesized by Claisen-Schmidt condensation method between o-hydroxyacetophenone and benzaldehyde using 4 different catalysts, namely KOH 60%, solid pellet of KOH-grinding technique, BF3-Et2O, and NaH in DMF. The KOH 60% was the best catalyst, giving the highest yield (57%). Afterward, the flavonol was synthesized in 1-stage oxidation cyclization of o-hydroxyacetophenone using Algar-Flynn-Oyamada (AFO) reaction, giving 76%. The flavonol total yield from 2’-hydroxychalcone was 43%. All synthesized products were characterized by their melting points and their spectra. The success of the synthesis flavonol opens the way to synthesis of useful flavonol derivatives such as quercetin and kaempferol
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