Logistic regression parameters for Japanese knotweed and mugwort.

<p>The parameters b and b* are the regression and standardized regression coefficients <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0001635#pone.0001635-Menard1" target="_blank">[30]</a>, respectively, and |b*| is the absolute value of the standardized regression coefficient.</p><p>Variables with a dagger (†) are log₁₀ transformed.</p

Habitat suitability of Japanese knotweed.

<p>Model predictions of habitat suitability based on the environmental and anthropogenic factors in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0001635#pone-0001635-t001" target="_blank">Table 1</a>.</p

Spatial clustering of invaded counties throughout the invasion history.

<p>Join count z-score test statistic values at each decadal interval since initial introduction for the contiguous US (A,D), and east (B,E) and west (C,F) of the 90^th meridian for Japanese knotweed (left column) and mugwort (right column). The bold line (1,1) represents adjoining counties both with a Japanese knotweed or mugwort record, the solid line (0,1) represents adjoining counties where one county has a weed record and the other does not, and the dashed line (0,0) represents adjoining counties where neither contain a weed record. Horizontal red bars show positive and negative Z-score thresholds at <i>P</i> = 0.05.</p

Logistic regression model accuracy and efficiency.

<p>Observed and expected number of US counties where each invasive was present for habitat suitability ≥0.5 for both the training and test datasets.</p>†<p>These values are for total number of counties without a population but have a probability ≥80% based on logistic regression results.</p

Habitat suitability of mugwort.

<p>Model predictions of habitat suitability based on the environmental and anthropogenic factors in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0001635#pone-0001635-t001" target="_blank">Table 1</a>.</p