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| public:rem4:rem4-20:design_of_comparative_experiments_ii [2020/03/25 20:07] – thorisson | public:rem4:rem4-20:design_of_comparative_experiments_ii [2024/04/29 13:33] (current) – external edit 127.0.0.1 |
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| === Example of an Experiment: Fishing Around Iceland === | === Example of an Experiment: Fish === |
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| | Theory | Temperature has an effect on cell growth of animals. This goes for fish as well. | | | Theory | Temperature has an effect on cell growth of animals. This goes for fish as well. | |
| | Motivation | If we can find evidence for this we might be able to grow larger fish in captivity; larger fish means fewer people starving (or more revenue - or both). | | | Motivation | If we can find evidence for this we might be able to grow larger fish in captivity; larger fish means fewer people starving (or more revenue - or both). \\ Fishing further South might be better for everyone, even those living in the North. | |
| | Hypothesis | That size of fish varies with ocean temperature. \\ | | | Hypothesis | That size of fish varies with ocean temperature. \\ | |
| | Method | Comparing the size of fish in the Atlantic Ocean by taking a sample from various latitudes. Argument: Temperature falls the further North one goes; thus, fish at higher latitudes should be smaller. | | | Experiment | Comparing the size of fish in the Atlantic Ocean by taking a sample from various latitudes. Argument: Temperature falls the further North one goes; thus, fish at higher latitudes should be smaller. | |
| | Sample | 100 fish south of Iceland. 100 fish north of Iceland. | | | Sample | 100 fish south of Iceland. 100 fish north of Iceland. | |
| | Dependent variable | Size of fish (continuous). | | | Dependent variable | Size of fish (continuous). | |
| | Statistics | Linear regression. | | | Statistics | Linear regression. | |
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| | === Example of an Experiment: Routers === |
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| | | Theory | Congestion on networks gets worse the smaller "visibility horizon" <m>H_v</m> each node <m>N_i</m> in a network has about traffic on other adjacent nodes. \\ <m>H_v</m>: Information about traffic, including past, present, and predicted. | |
| | | Motivation | Knowing whether nodes from router manufacturer X or Y are a better purchase might be decided by looking at their implemented routing methods. \\ Knowing how to set parameters on already-purchased routing nodes might be put on a more scientific ground. | |
| | | Experiment | Comparing routers from ZYX and Cis. The former advertise their routers to be "network-aware" whereas the latter brag about being "perfect for P2P networks" because each node doesn't need to know anything about the rest of the network. | |
| | | Hypothesis | Routers from ZYX will perform better at handling congestion than routers from Cis. | |
| | | Independent variables | 1. Router type. \\ 2. Traffic. \\ 3. Network size. | |
| | | Dependent variables | 1. Congestion. \\ 2. Congestion recovery. \\ 3. Routing efficiency. | |
| | | Statistics | MANOVA | |
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