1 Zinc Data EPP 245 Statistical Analysis of Laboratory Data.

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EPP 245 Statistical Analysis of Laboratory Data

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1 Zinc Data EPP 245 Statistical Analysis of Laboratory Data

October 25, 2007EPP 245 Statistical Analysis of Laboratory Data 2. insheet using "Zinc.raw" (2 vars, 91 obs). do "zinc.do". regress peakarea concentration Source | SS df MS Number of obs = F( 1, 89) = Model | e e+11 Prob > F = Residual | R-squared = Adj R-squared = Total | e e+09 Root MSE = peakarea | Coef. Std. Err. t P>|t| [95% Conf. Interval] concentrat~n | _cons | scatter peakarea concentration || lfit peakarea concentration. graph export zinc1.wmf, replace. rvfplot. graph export zinc2.wmf, replace. display (1850-_b[_cons])/_b[concentration]

October 25, 2007EPP 245 Statistical Analysis of Laboratory Data 3

October 25, 2007EPP 245 Statistical Analysis of Laboratory Data 4

October 25, 2007EPP 245 Statistical Analysis of Laboratory Data 5. keep if concentration == 0 (83 observations deleted). list concentration peakarea | concen~n peakarea | | | 1. | | 2. | | 3. | | 4. | | 5. | | | | 6. | 0 93 | 7. | 0 99 | 8. | | summarize peakarea Variable | Obs Mean Std. Dev. Min Max peakarea | display *