## 3 Methodology
### Dataset  
The collected data (Made publicly available at [[https://github.com/researchrepo1/EssentialOilsDataset](https://github.com/researchrepo1/EssentialOilsDataset)]([https://github.com/researchrepo1/EssentialOilsDataset](https://github.com/researchrepo1/EssentialOilsDataset)) (accessed on 30 May 2024)) used in this research work comprise 21 essential oil samples and 428 chemical compounds, which represent the chemical composition percentages of these essential oils. These oil samples, available commercially in the United Arab Emirates market, were chosen based on the reported literature that indicate their potential activity against Alzheimer's Disease progression [20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 46; 47; 48; 49; 50]. The chemical composition data were gathered from the literature. Each essential oil sample was classified as \"HIGH\" or \"LOW\" in activity, with eight samples classified as \"HIGH\" and 13 as \"LOW\". This classification was based directly on the literature available about each oil. Oils classified as \"HIGH\" reported significant activity relevant to Alzheimer's Disease, such as neuroprotection or acetylcholinesteraseinextase inhibition. Oils classified as \"LOW\" either showed low activity, or there was insufficient literature to conclusively determine their efficacy. The 21 essential oils examined in this study contain 428 chemical compounds in total, as reported in the literature. Out of which, 12 compounds were present in four or more essential oils. These compounds, along with their concentrations, are shown in Figures 1-3, which portray a visual representation of how each compound is concentrated in each oil. As per Figure 1, the compound 1,8-Cineole is concentrated the highest in Rosemary oil at 26.54%, and is found with much lower concentrations in the remaining oils: Sweet Violet at 1.92%, Costus at 1.73%, Hazelnut at 1%, and in negligible concentrations with the remaining oils. The compound Camphene is concentrated the highest in Ginger oil at 32.79%, followed by Rosemary oil at 11.38% and Costus oil at 4.96%. It was found in less than 1% concentrations in the remaining oils. The compound Camphene is mostly concentrated in Rosemary oil at 12.88%, in Costus oil at 2.11%, in Sweet Violet Oil at 0.92% and in Henna at 0.27%. It is noticeably clear that Limonene is highly concentrated in Graprefruit oil at 94.20%, in Juniper oil at 12.10%, and at much lower concentrations in the remaining oils. The compound Linalool is concentrated the highest in Apricot oil at 6.38%, in Sweet Violet oil at 3.06%, in Mint oil at 2.22%, in Henna oil at 1.58% and in less than 1% concentrations in the remaining oils. The compound Spathulenol is concentrated the highest in Sweet Violet oil at 2.54% and in Hazelnut oil at 1.80%. It is also found in Chamomile and Anjeer oils at 0.20% and 0.10% concentrations, respectively. In Figure 2, it is noticed that the compound \(\alpha\)-Pinene is concentrated the highest in Juniper oil at 29.10%, followed closely by Rosemary oil at 20.14% and in Ginger oil at 18.05%. It is also found in less than 2% concentrations in the remaining oils. The compound \(\alpha\)-Terpineol is concentrated the highest in Hazelnut oil at 2.30%, in Rosemary oil at 1.95%, in Mint oil at 0.23% and in Costus oil at 0.11%, while the compound \(\alpha\)-Thujene is concentrated the highest in Juniper oil at 2.30%, and in smaller concentrations in Rosemary, Grapefruit, Chamomile oils at 0.27%, 0.24% and 0.20%, respectively. The compound \(\beta\)-Elemene is concentrated the highest in Gum Myrrh oil at 2.20%, followed by Ginsing oil at 1.50%, at 0.40% concentration in Chamomile oil, and at a negligible 0.04% concentration in Costus oil. The compound \(\beta\)-Pinene is primarily concentrated in Juniper oil at 17.60% and at a much lower concentration of 6.59% in Rosemary oil. It is also found in several other oils but at less than 3% concentration.