Figure 1: Upper: Comparison of frequency distributions of raw TN data and transformed TLn data for all lakes. Lower: Box and whisker plots for distributions of TLI components and aggregate TLI for all lakes
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Notes: Horizontal lines within boxes show median values, boxes show 25–75% data ranges, whiskers show 5–95% ranges, and points are outliers outside the 5–95% ranges.
Text description of figure
Top graph is a histogram comparing the raw total nitrogen (TN) data that is heavily skewed to the left (i.e. many low values) with log-tranfomed data that forms a normal (bell-shaped) distribution. The bottom graph is a box and whisker plot that shows the normally distributed (i.e. log-transformed) data for the 4 elements of the TLI (Chla, Secchi, TN and TP) as medians, ranges and outliers (refer to figure note for further description).
