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Statistical Methods for Bioscience II

by: Imelda Casper

Statistical Methods for Bioscience II HORT 572

Imelda Casper
GPA 3.74

Jiwei Zhao

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About this Document

Jiwei Zhao
Class Notes
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Popular in Agricultural & Resource Econ

This 2 page Class Notes was uploaded by Imelda Casper on Thursday September 17, 2015. The Class Notes belongs to HORT 572 at University of Wisconsin - Madison taught by Jiwei Zhao in Fall. Since its upload, it has received 22 views. For similar materials see /class/205252/hort-572-university-of-wisconsin-madison in Agricultural & Resource Econ at University of Wisconsin - Madison.

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Date Created: 09/17/15
StatFampWHort 572 HwangZhao January 26 2009 DISCUSSION 1 TAS Information TA Of ce amp Phone YoungDeok Hwang 1335R MSC7 263 5948 http www stat wisc eduquothwang Ernail hwangstatwiscedu Of ce hours T 0220 0320 W 0950 1040 TA Jiwei Zhao httpwwwstatwisc eduzhaoj Of ce amp Phone 1275B MSC7 262 1577 Email zhaoj statwiscedu Of ce hours M 1200 0100 T 0130 0230 Examples 1 Read the Acorn Size data from httplibstatcmueduDASLDatafilesAcornshtml to a Plot Acorn size versus range Draw side by side boxplots of Acorn size versus region Describe the relationship between these variables b Fit one linear model to predict acorn size using range as unique predictor Write the tted model in the form Size in 7 7 7 Range in 7 c Fit one linear model to predict acorn size using both range and region as predictors Write the tted model in the form Size in 7 7 7 Range in 7 for each region group d Describe the summaries of the tted models above e Give the residuals versus tted values plots in both models A study was conducted to investigate the relationship between the size of the ants and the distance at which they foraged Ants were collected at various distance from the colony and measured Head width is measured in mm and utilized as a good indicator of an ant s size Distance is measured in meters and indicates how far the mound is from places where they were captured while foraging head width distance colony 1895 1811 1179 1684 1937 1768 dugtugtHH DHMHMH Construct the matrix X for a multiple regression model to predict the ant size from colony and distance if a Distance is treated as quantitative and colony is treated as a factor with levels 1 and 2 b Distance is treated as a factor with levels 17 4 and 77 and colony is treated as a factor with levels 1 and StatFampWHort 572 HwangZhao January 26 2009 Solutions L acorns readtable acornstxt headerT stracorns try the follwing commands which works for the same acorns readtablefilechoose headerT draw a plot to take an overlook the data plotAcornsizequotRangedataacorns plotAcornsizequotRangecolRegiondataacorns draw a boxwhisker plot librarylattice bwplotAcornsizequotRegion dataacorns boxplotAcornsizequotRegion dataacorns fit a linear model fitl lt lmAcornsizequotRange dataacorns summaryfit1 plotfit1which1 plotresidualsfit1quotfittedfit1 try different model fit2 lt lmAcornsizequotRangeRegion dataacorns summaryfit2 plotfit2which1 plotresidualsfit2quotfittedfit2 try the other fitS lt lmAcornsizequotRangeRegion dataacorns summaryfit3 plotfit3which1 plotresidualsfit3quotfittedfit3 110 111 140 2X141 170 171 1000 1001 1100 X 1101 1010 1011


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