Table 2. . 239-240 : 7 2 Estimated Pu Concentrations (uNCi/m™” per 5-cm Depth) at Grid Nodes Near GZ Using Untransformed and Log-Transformed 39-240py Observations. Iteration Untransformed B72g208 20 252 1 2 3 * 354 629 210 8 -434 92 223 210 618 Log Transformed* B721409 - 62 11? 1045 2171 291 ~=10340 126 664 175 - 156 ~ 25 100 512 E721600 97 223 135 15 198 - E721200 68 N936400 «(13 199 N936100 34 1804 272 113 527 660 508 382 564 682 265 239 280 100 109 76 78 84 84 N 41 108 77 186 E721600 77 129 251 963 259 5058 105 128 76 166 79 186 216 18 114 202 58 255 281 77 125 77 248 288 378 53 83 76 418 173 62 475 50 52 941 167 82 373 392 183 15535 - -460 372 638 477 385 644 782 366 219 53 697 1014 18130 1438 236 83 396 469 206 81 108 ~ 304 1121 211 140 - lll 288 248 282 18856 67 59 55 65 133 ~ 135 -1019 283 785 632 86 189 236 191 375 801 1016 69 194 181 717 295 290 54 9 125 137 859 937 35 44 43 317 277 37793 1459 311 91 78 123 63 96 398 544 237 371 128 - 152 88 254 39 647 217 151 - 382 - a 1137 96 45 76 93 248 621 1787 135 23 -430 190 N935800 96 172 8721800 738 39 43 104 361 301 278 206 76 77 41 241 381 298 246 A Tabled values are exp(Zce r), where zor is the estimated plutonium concentration (log scale) at grid coordinate (XY). ; The goodness-of-fit of the estimated surface to observed concentrations at sample collection points can be measured by squaring the linear correlation coefficient between the observed data and the estimated surface at the sampling locations.* This statistic (R2, the percent of the total variation at sample locations explained by the fitted surface) is plotted in Figure 12 for each stratum, iteration, and fitting scale. The fits are very good for strata 1 and 2 for the untransformed as well as for the log and antilog fits. R* tends to decrease for strata near GZ particularly for the untransformed and antilog scales. The effect of iterating is to increase R* in all strata for all three *Pierre Delfiner pointed out (personal communication) that R2 will tend to be overoptimistic as a measure of goodness of fit since y, and ¥. tend to be correlated when Vy is obtained using a nearest neighbor approach. 338