PRINCIPLES OF DATA QUALITY Arthur D. Chapman1 Although most data gathering disciples treat error as an embarrassing issue to be expunged‚ the error inherent in [spatial] data deserves closer attention and public understanding …because error provides a critical component in judging fitness for use. (Chrisman 1991). Australian Biodiversity Information Services PO Box 7491‚ Toowoomba South‚ Qld‚ Australia email: papers.digit@gbif.org 1 © 2005‚ Global Biodiversity Information Facility Material
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correlation coefficients (r2). The correlation coefficients were 0.999 for lamivudine‚ 0.999 zidovudine and 0.999 for nevirapine. The results of the linearity experiment are listed in Table 4.Linearity graphs were shown in Figure 3 Accuracy (% recovery): The accuracy parameter conducted by using the standard addition method. The proposed method afforded a recovery of 99.49–101.54% after the additional standard drug solution
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appropriately. How to use a Pipette: • A pipette is a laboratory tool commonly used in chemistry‚ biology and medicine to transport a measured volume of liquid. Pipettes come in several designs for various purposes with differing levels of accuracy and precision.
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Donald A. Kelley Professor Emil Hazarian QAS-347: Dimensional Metrology 29 November 2012 Basic Principles of Metrology Imagine a world with no regard for accuracy. What would happen if no one could agree on terms of time‚ length‚ weight‚ or the amount of electrical energy in a volt? Advances in electricity and electronics during the past century have made accurate measurement of many different properties essential. We wake up to electrical alarm clocks‚ cook in microwave ovens‚ and regulate
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means a high probability of confidence in the prediction ability of the classification model. 5.6 Results and Discussion The post and thread classification results using four classification algorithms are compared using evaluation measures of Accuracy‚ Precision‚ Recall and F-measure. In addition‚ performance measures of ROC‚ AUC‚ Lift and Cost are used for in-depth analysis. 5.6.1 Post
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Problem What effect does the different concentration of hydrochloric acid have to the rate of diffusion of agar that is dissolved with sodium carbonate and phenolphthalein? Introduction Diffusion is a process where the molecules intermingle as a result of their kinetic energy of random motion and is the net movement of like molecules down their concentration gradient‚ which is the energy inherent in their constant molecular motion makes them collide and careen outward from the region of higher
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Weighed accurately about 25.0 mg of baclofen and transferred to 25 ml volumetric flask. Added 20 ml of a 0.001 M aqueous hydrochloric acid solution and sonicated to dissolve and degassed. The resultant solution diluted up to the mark with diluents to obtain 1000 μg/ml. Further stock solution was used to prepare plasma standards to construct the calibration curve. C. Pre-chromatographic isolation of baclofen from plasma Prior to chromatography‚ baclofen from plasma constituents was isolation by adding
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of air travel? WAAS‚ the Wild Area Augmentation System is an air navigation system developed by the FAA to Augment GPS satellites. WAAS is used to track aircraft in flight to better improve its accuracy and ability to locate aircraft within 25 ft. actual measurements of the system have shown accuracy as precise as 3 ft 3 in. laterally and 4 ft 11 in. vertically throughout most of the United States and Canada. The WAAS system has the ability to critique itself and correct problems such as incorrect
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request to leave on her own‚ or continue on the path Hailsham set her on. Her choice is to complete her donations‚ since she decides that fighting it is useless. The motif used to develop the theme‚ animals created by Tommy‚ shows how he stuck to the precision from Hailsham‚ and that he wasn’t willing to change himself once he
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| |Volume |Measuring cyinder | |Current |Ammeter | Uncertainties‚Accuracies and Error in measurements When we take measurement there are always uncertainties in the values.For example the diameter of a pencil is 7.5mm if we use a ruler with mm scale.The rulercan measure up to the nearest 0.5mm.But if we use amicrometer
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