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"6#*(-%$exp G6#,$%'lambdaG!\"\"\"\"\")F(%\"kGF*-%*factorialG6#F,F)" }{TEXT -1 5 " \+ , " }{TEXT 264 1 "k" }{TEXT -1 15 " = 0, 1, 2, ..." }}{PARA 0 "" 0 " " {TEXT 258 3 " " }}{PARA 0 "" 0 "" {TEXT -1 29 "Recall the conventi on 0! = 1." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 69 "The following code will draw a probability histogram for the Po isson(" }{XPPEDIT 18 0 "lambda" "6#%'lambdaG" }{TEXT -1 14 ") distribu tion" }}{PARA 0 "" 0 "" {TEXT -1 4 "for " }{XPPEDIT 18 0 "lambda" "6#% 'lambdaG" }{TEXT -1 50 "=2, but you are encouraged to try other values of " }{XPPEDIT 18 0 "lambda" "6#%'lambdaG" }{TEXT -1 1 "." }}{PARA 0 "" 0 "" {MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 10 "lambda:=2;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%'lambdaG\"\"#" }}} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 40 "ProbHist(PoissonPDF(lambda,x ),0..20,21);" }}{PARA 13 "" 1 "" {GLPLOT2D 400 300 300 {PLOTDATA 2 "6& -%'CURVESG6#7`p7$$!1+++++++]!#;\"\"!7$F($\"1+++KGN`8F*7$$\"1+++++++]F* F-7$F0F+F27$F0$\"1+++kcq1FF*7$$\"1+++++++:!#:F47$F7F+F:F67$$\"1+++++++ DF9F47$F7$F<$\"1+++U/Z/=F*7$$\"1+++++++NF9F@7$FCF+FE7$FC$\"1+++9A NA!*!#<7$$\"1+++++++XF9FG7$FKF+FM7$FK$\"1+++')3%*3OFI7$$\"1+++++++bF9F O7$FRF+FT7$FR$\"1+++&H!)H?\"FI7$$\"1+++++++lF9FV7$FYF+Fen7$FY$\"1+++el 3PM!#=7$$\"1+++++++vF9Fgn7$F[oF+F]o7$F[o$\"1+++$R;Ff)!#>7$$\"1+++++++& )F9F_o7$FcoF+Feo7$Fco$\"1+++KD\\4>Fao7$$\"1+++++++&*F9Fgo7$FjoF+F\\p7$ Fjo$\"1+++k])*=Q!#?7$$\"1++++++]5!#9F^p7$FbpF+Fep7$Fbp$\"1+++2#4O%p!#@ 7$$\"1++++++]6FdpFgp7$F[qF+F]q7$F[q$\"1+++,#os:\"Fip7$$\"1++++++]7FdpF _q7$FbqF+Fdq7$Fbq$\"1+++CH$e!#G7$$\"1 ++++++]>FdpFft7$FjtF+F\\u7$Fjt$\"1*****f>CH$e!#H7$$\"1++++++]?FdpF^u7$ FbuF+-%+AXESLABELSG6$%!GFhu-%'COLOURG6&%$RGBGF+F+$\"*++++\"!\")-%%VIEW G6$%(DEFAULTGFcv" 1 2 0 1 0 2 6 1 4 2 1.000000 45.000000 45.000000 0 } }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 21 "To see the effect of " }{XPPEDIT 18 0 "lambda" "6#%'lambdaG" }{TEXT -1 29 " on the shape of the Poisson(" }{XPPEDIT 18 0 "lambda" "6#%'lam bdaG" }{TEXT -1 29 ") distribution, the following" }}{PARA 0 "" 0 "" {TEXT -1 58 "animation will draw a series of probability histograms as " }{XPPEDIT 18 0 "lambda" "6#%'lambdaG" }{TEXT -1 21 " varies from 1 \+ to 15." }}{PARA 0 "" 0 "" {MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 21 "for n from 1 to 15 do" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 31 "num:=convert(evalf(n), string):" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 59 "tracker[n]:=textplot([18,0.3,`Lambda is `.num],color= blue):" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 41 "H[n]:=ProbHist(PoissonPDF (n,x),0..25,26):" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 33 "P[n]:=display( \{H[n],tracker[n]\}):" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 3 "od:" }} {PARA 0 "> " 0 "" {MPLTEXT 1 0 89 "display([seq(P[n], n=1..15)], inseq uence=true,title=\"Lambda is Increasing from 1 to 15\");" }}{PARA 13 " " 1 "" {GLPLOT2D 400 300 300 {PLOTDATA 2 "6$-%(ANIMATEG617&-%'CURVESG6 $7dq7$$!1+++++++]!#;\"\"!7$F,$\"1+++7WzyOF.7$$\"1+++++++]F.F17$F4F/F6F 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"" }{TEXT 265 0 "" }{TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 47 "We can calculate probabilities for the Poisson(" } {XPPEDIT 18 0 "lambda" "6#%'lambdaG" }{TEXT -1 43 ") distribution usin g either the probability" }}{PARA 0 "" 0 "" {TEXT -1 90 "distribution \+ function (PDF) or the cumulative distribution function (CDF). We will denote" }}{PARA 0 "" 0 "" {TEXT -1 11 "the PDF by " }{TEXT 266 1 "f" }{TEXT -1 16 " and the CDF by " }{TEXT 267 1 "F" }{TEXT -1 59 ". We w ill consider these functions for a variable X having" }}{PARA 0 "" 0 " " {TEXT -1 28 "the Poisson(2) distribution." }}{PARA 0 "" 0 "" {MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 10 "lambda :=2;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%'lambdaG\"\"#" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 27 "f:=x->PoissonPDF(lambda,x);" }} {PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"fGR6#%\"xG6\"6$%)operatorG%&arrowG F(-%+PoissonPDFG6$%'lambdaG9$F(F(F(" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 27 "F:=x->PoissonCDF(lambda,x);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"FGR6#%\"xG6\"6$%)operatorG%&arrowGF(-%+PoissonCDFG6 $%'lambdaG9$F(F(F(" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 57 "Below you will find three different ways to calcu late P( " }{XPPEDIT 18 0 "X <=3" "6#1%\"XG\"\"$" }{TEXT -1 6 " ) . " }}{PARA 0 "" 0 "" {MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 27 "evalf(f(0)+f(1)+f(2)+f(3));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"+-YBr&)!#5" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 24 "evalf(sum(f(x),x=0..3));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"+ -YBr&)!#5" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 12 "evalf(F(3));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"+-YBr&)!#5" }}}}{SECT 1 {PARA 3 " " 0 "" {TEXT -1 30 "Properties of the Distribution" }}{EXCHG {PARA 0 " " 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT 268 61 "Calculation of Me an, Variance, and Moment Generating Function" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }{MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }} {PARA 0 "" 0 "" {TEXT -1 14 "Calculating E(" }{TEXT 269 1 "X" }{TEXT -1 42 "), the expectation or mean of the Poisson(" }{XPPEDIT 18 0 "lam bda" "6#%'lambdaG" }{TEXT -1 15 ") distribution." }}{PARA 0 "" 0 "" {MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 8 "restart ;" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 12 "with(plots):" }}} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 27 "f:=x->PoissonPDF(lambda,x); " }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"fGR6#%\"xG6\"6$%)operatorG%&ar rowGF(-%+PoissonPDFG6$%'lambdaG9$F(F(F(" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 40 "EX:=simplify(sum(x*f(x),x=0..infinity));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#EXG%'lambdaG" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 16 "Calculating Var(" }{TEXT 270 1 "X" }{TEXT -1 31 "), the variance of the Poisson(" }{XPPEDIT 18 0 "lambda" "6#%'lambdaG" }{TEXT -1 15 ") distribution." }}{PARA 0 "" 0 "" {TEXT -1 33 "We will employ the formula: Var(" }{TEXT 271 1 "X" }{TEXT -1 7 ") = E( " }{XPPEDIT 18 0 "X^2;" "6#*$%\"XG\"\"#" }{TEXT -1 5 " ) - " }{XPPEDIT 18 0 "( E(X) )^2" "6#*$-%\"EG6#%\"XG\"\"#" }} {PARA 0 "" 0 "" {MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 46 "E_X_SQ:=simplify(sum(x^2*f(x),x=0..infinity));" }} {PARA 11 "" 1 "" {XPPMATH 20 "6#>%'E_X_SQG*&%'lambdaG\"\"\",&F&F'F'F'F '" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 28 "VarX:=simplify(E_X_SQ- EX^2);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%%VarXG%'lambdaG" }}} {EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 72 "Th e Moment Generating Function (MGF) can be easily calculated via Maple. " }}{PARA 0 "" 0 "" {TEXT -1 71 "Recall the moment generating function of a random variable X is defined" }}{PARA 0 "" 0 "" {TEXT -1 3 "as \+ " }{TEXT 273 1 "M" }{TEXT -1 1 "(" }{TEXT 274 3 " t " }{TEXT -1 6 ") = E(" }{XPPEDIT 18 0 "exp(tX)" "6#-%$expG6#%#tXG" }{TEXT -1 36 "), prov ided this expectation exists." }}{PARA 0 "" 0 "" {TEXT -1 0 "" } {MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 43 "simpli fy(sum(exp(t*x)*f(x),x=0..infinity));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#-%$expG6#*&%'lambdaG\"\"\",&!\"\"F(-F$6#%\"tGF(F(" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 48 "So the moment g enerating function for a Poisson(" }{XPPEDIT 18 0 "lambda" "6#%'lambda G" }{TEXT -1 18 ") random variable " }}{PARA 0 "" 0 "" {TEXT -1 11 "is given by" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 4 " " }{TEXT 275 1 "M" }{TEXT -1 2 "( " }{TEXT 276 1 "t" }{TEXT -1 5 " ) = " }{XPPEDIT 18 0 "exp(lambda*(exp(t) -1))" "6#-%$expG6#*&%'lam bdaG\"\"\",&-F$6#%\"tGF(\"\"\"!\"\"F(" }{TEXT -1 1 " " }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 15 "We will define " } {TEXT 277 1 "M" }{TEXT -1 2 "( " }{TEXT 278 1 "t" }{TEXT -1 20 " ) as \+ a function of " }{TEXT 279 1 "t" }{TEXT -1 1 "." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }{MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 29 "M:=t->exp(lambda*(exp(t)-1));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"MGR6#%\"tG6\"6$%)operatorG%&arrowGF(-%$expG6#*&%'la mbdaG\"\"\",&-F-6#9$F1!\"\"F1F1F(F(F(" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 76 "The moment generating fun ction provides us alternative ways to calculate the" }}{PARA 0 "" 0 " " {TEXT -1 40 "mean and variance by way of the formula." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 4 " " }{XPPEDIT 18 0 "M^r;" "6#)%\"MG%\"rG" }{TEXT -1 9 " (0) = E(" }{XPPEDIT 18 0 "X^r" "6 #)%\"XG%\"rG" }{TEXT -1 10 ") , where " }{XPPEDIT 18 0 "M^r" "6#)%\"MG %\"rG" }{TEXT -1 1 "(" }{TEXT 280 1 "t" }{TEXT -1 14 ") denotes the " }{TEXT 281 1 "r" }{TEXT -1 18 " th derivative of " }{TEXT 282 1 "M" } {TEXT -1 1 "(" }{TEXT 283 1 "t" }{TEXT -1 18 ") with respect to " } {TEXT 284 1 "t" }{TEXT -1 1 "." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }} {PARA 0 "" 0 "" {TEXT -1 30 "This formula holds as long as " }{TEXT 285 1 "M" }{TEXT -1 1 "(" }{TEXT 286 1 "t" }{TEXT -1 45 ") exists in a n open interval containing zero." }}{PARA 0 "" 0 "" {TEXT -1 79 "See, \+ for example, Mathematical Statistics and Data Analysis by John A. Rice for" }}{PARA 0 "" 0 "" {TEXT -1 39 "more on the moment generating fun ction." }}{PARA 0 "" 0 "" {MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 18 "M_p:=diff(M(t),t);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$M_pG*(-%$expG6#%\"tG\"\"\"%'lambdaG\"\"\"-F'6#*&F+F*,&!\"\"F* F&F*F*F*" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 14 "simplify(M_p); " }}{PARA 11 "" 1 "" {XPPMATH 20 "6#*&%'lambdaG\"\"\"-%$expG6#,(%\"tG \"\"\"F$!\"\"*&-F'6#F*F+F$F+F+F+" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 24 "simplify(subs(t=0,M_p));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#%'lambdaG" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }} {PARA 0 "" 0 "" {TEXT -1 17 "And therefore if " }{TEXT 287 1 "X" } {TEXT -1 14 " is a Poisson(" }{XPPEDIT 18 0 "lambda" "6#%'lambdaG" } {TEXT -1 19 ") variable, then E(" }{TEXT 288 1 "X" }{TEXT -1 4 ") = " }{XPPEDIT 18 0 "lambda" "6#%'lambdaG" }{TEXT -1 20 " , which agrees wi th" }}{PARA 0 "" 0 "" {TEXT -1 57 "what we found earlier. Now turning to the second moment." }}{PARA 0 "" 0 "" {MPLTEXT 0 21 0 "" }}} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 18 "M_pp:=diff(M_p,t);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%%M_ppG,&*(-%$expG6#%\"tG\"\"\"%'lambdaG\" \"\"-F(6#*&F,F+,&!\"\"F+F'F+F+F+F+*()F'\"\"#F-)F,F5F-F.F-F+" }}} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 25 "simplify(subs(t=0,M_pp));" } }{PARA 11 "" 1 "" {XPPMATH 20 "6#,&*$)%'lambdaG\"\"#\"\"\"\"\"\"F&F)" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 12 "Therefore E(" }{XPPEDIT 18 0 "X^2" "6#*$%\"XG\"\"#" }{TEXT -1 4 ") = \+ " }{XPPEDIT 18 0 "lambda^2+lambda" "6#,&*$%'lambdaG\"\"#\"\"\"F%F'" } {TEXT -1 45 " , which again is in agreement with the value" }}{PARA 0 "" 0 "" {TEXT -1 64 "calculated previously. The variance is now quickl y calculated as" }}{PARA 0 "" 0 "" {TEXT -1 4 "Var(" }{TEXT 289 1 "X" }{TEXT -1 7 ") = E( " }{XPPEDIT 18 0 "X^2;" "6#*$%\"XG\"\"#" }{TEXT -1 5 " ) - " }{XPPEDIT 18 0 "( E(X) )^2" "6#*$-%\"EG6#%\"XG\"\"#" }} {PARA 0 "" 0 "" {TEXT -1 14 " = " }{XPPEDIT 18 0 "lambda^2+ lambda-lambda^2" "6#,(*$%'lambdaG\"\"#\"\"\"F%F'*$F%\"\"#!\"\"" }} {PARA 0 "" 0 "" {TEXT -1 14 " = " }{XPPEDIT 18 0 "lambda" " 6#%'lambdaG" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }{MPLTEXT 0 21 0 "" }}} {EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT 272 18 "S pecial Properties" }}{PARA 0 "" 0 "" {MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 55 "You proba bly noticed in the previous animation that as " }{XPPEDIT 18 0 "lambda " "6#%'lambdaG" }{TEXT -1 56 " grew larger, the probability histogram \+ for the Poisson(" }{XPPEDIT 18 0 "lambda" "6#%'lambdaG" }{TEXT -1 110 ") distribution seemed to become increasingly more bell-shaped (i.e., \+ normal). Look again at the animation for " }{XPPEDIT 18 0 "lambda" "6# %'lambdaG" }{TEXT -1 53 " varying from 1 to 15 with an overlayed norma l curve." }}{PARA 0 "" 0 "" {MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 21 "for n from 1 to 15 do" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 31 "num:=convert(evalf(n), string):" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 59 "tracker[n]:=textplot([18,0.3,`Lambda is `.num],color= blue):" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 41 "H[n]:=ProbHist(PoissonPDF (n,x),0..25,26):" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 39 "N[n]:=plot(Norm alPDF(n,n,x),x = 0..25):" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 38 "P[n]:=d isplay(\{H[n],N[n],tracker[n]\}):" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 3 "od:" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 120 "display([seq(P[n], n=1..15 )], insequence=true,title=\"Normal Approx. to the Poisson. 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gjl7$Fejl$\"1,++*)3og&*F[s7$F\\[mFcf^lF^[mF^[m7$F\\[m$\"1+++n'eV-\"F@7 $Fd[mFgf^lFf[mFf[mFif^l7$F[\\mFgf^lF]\\mF]\\m7$F[\\m$\"1+++,DO.'*F[s7$ Fb\\mF\\g^lFd\\mFd\\m7$Fb\\m$\"1+++Y^bt%)F[s7$Fj\\mF`g^lF\\]mF\\]m7$Fj \\m$\"1,++bfHhqF[s7$Fb]mFdg^lFd]mFd]m7$Fb]m$\"1+++MtqubF[s7$Fi]mFhg^lF [^mF[^m7$Fi]m$\"1++++0.\"=%F[s7$Fa^mF\\h^lFc^mFc^m7$Fa^m$\"1+++d.X')HF [s7$Fi^mF`h^lF[_mF[_m7$Fi^m$\"1+++`h@O?F[s7$F`_mFdh^lFb_mFb_m7$F`_m$\" 1+++cq'zK\"F[s7$Fh_mFhh^lFj_mFj_m7$Fh_m$\"1,+++Tz*H)F`t7$F_`mF\\i^lFa` mFa`m7$F_`m$\"1+++gk()z\\F`t7$Fg`mF`i^lFi`mF2Fj`mF`am-%&TITLEG6#Q[oNor mal~Approx.~to~the~Poisson.~Lambda~is~increasing~from~1~to~15F^am" 1 2 0 1 0 2 9 1 4 2 1.000000 45.000000 45.000000 0 }}}}{EXCHG {PARA 0 " " 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 11 "Indeed, as " } {XPPEDIT 18 0 "lambda" "6#%'lambdaG" }{TEXT -1 30 " becomes larger , t he Poisson(" }{XPPEDIT 18 0 "lambda" "6#%'lambdaG" }{TEXT -1 35 ") dis tribution becomes increasingly" }}{PARA 0 "" 0 "" {TEXT -1 32 "well ap proximated by the Normal(" }{XPPEDIT 18 0 "lambda" "6#%'lambdaG" } {TEXT -1 1 "," }{XPPEDIT 18 0 "lambda" "6#%'lambdaG" }{TEXT -1 15 ") d istribution." }}{PARA 0 "" 0 "" {MPLTEXT 0 21 0 "" }}}{EXCHG {PARA 0 " > " 0 "" {MPLTEXT 1 0 0 "" }}}}{SECT 1 {PARA 3 "" 0 "" {TEXT -1 10 "Si mulation" }}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }{TEXT 290 0 "" } {MPLTEXT 0 21 0 "" }}{PARA 0 "" 0 "" {TEXT -1 284 "We will now simulat e some data from a poisson distribution in order to compare the sampli ng distribution to the theoretical distribution. The next bit of code will simulate a random sample of size 500 from a Poisson(5) distribut ion, but you are invited to change the value of lambda." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 0 "" }}} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 21 "restart: with(plots):" }}} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 23 "lambda:=5: numsim:=500:" }}} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 32 "sample:=PoissonS(lambda,nums im):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 37 "a:=Histogram(sample ,-0.5..15+0.5,16):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 43 "b:=Pr obHist(PoissonPDF(lambda,x),0..16,17):" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 60 "display([a,b],title=\"Simulated(red) vs. Theoretical( blue)\");" }}{PARA 13 "" 1 "" {GLPLOT2D 400 300 300 {PLOTDATA 2 "6'-%' CURVESG6%7\\o7$$!1+++++++]!#;\"\"!7$F($\"1+++++++!)!#=7$$\"1+++++++]F* F-7$F1F+F37$F1$\"1+++++++M!#<7$$\"1+++++++:!#:F57$F9F+F<7$F9$\"1++++++ +'*F77$$\"1+++++++DF;F>7$FAF+FC7$FA$\"1++++++S8F*7$$\"1+++++++NF;FE7$F HF+FJ7$FH$\"1++++++?=F*7$$\"1+++++++XF;FL7$FOF+FQ7$FO$\"1++++++g;F*7$$ \"1+++++++bF;FS7$FVF+FX7$FV$\"1++++++?9F*7$$\"1+++++++lF;FZ7$FgnF+Fin7 $Fgn$\"1++++++g6F*7$$\"1+++++++vF;F[o7$F^oF+F`o7$F^o$\"1+++++++cF77$$ \"1+++++++&)F;Fbo7$FeoF+Fgo7$Feo$\"1+++++++GF77$$\"1+++++++&*F;Fio7$F \\pF+F^p7$F\\p$\"1+++++++;F77$$\"1++++++]5!#9F`p7$FcpF+FfpFbp7$$\"1+++ +++]6FepF`p7$FhpF+Fjp7$Fhp$\"1+++++++gF/7$$\"1++++++]7FepF\\q7$F_qF+Fa qFaq7$$\"1++++++]8FepF+FbqFbqFbq7$$\"1++++++]9FepF+FeqFeqFeq7$$\"1++++ ++]:FepF+Fhq-%'COLOURG6&%$RGBG$\"*++++\"!\")F+F+-%*LINESTYLEG6#\"\"$-F $6$7`oF'7$F($\"1+++**p%zt'F/7$F1FjrF3F37$F1$\"1++++N(*oLF77$F9F^sF7$FfqF_vFeqFeq7 $Ffq$\"1+++VVXs:Fav7$FiqFdvFhqFhq7$Fiq$\"1+++A)>R\"\\!#?7$$\"1++++++]; FepFhv7$F\\wF+-F\\r6&F^rF+F+F_r-%&TITLEG6#QESimulated(red)~vs.~Theoret ical(blue)6\"-%+AXESLABELSG6$%!GFiw-%%VIEWG6$%(DEFAULTGF]x" 1 2 0 1 0 2 9 1 4 2 1.000000 45.000000 45.000000 0 }}}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 63 "Now let's compare the sim ulated mean to the theoretical mean. " }}{PARA 0 "" 0 "" {TEXT -1 0 " " }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 18 "theo_mean:=lambda;" }} {PARA 11 "" 1 "" {XPPMATH 20 "6#>%*theo_meanG\"\"&" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 30 "sim_mean:=evalf(Mean(sample));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%)sim_meanG$\"++++e\\!\"*" }}}{EXCHG {PARA 0 " > " 0 "" {MPLTEXT 1 0 47 "relative_error:=(sim_mean-theo_mean)/theo_me an;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%/relative_errorG$!+++++%)!#7 " }}}}}{MARK "1" 0 }{VIEWOPTS 1 1 0 1 1 1803 }