A data frame has one factor, one date, and one numeric column. When I plot these using the default pch of the open circle (first attachment),
xyplot(TDS ~ sampdate | she.s, data = sheep.cast, main = 'TDS in Sheep Creek', ylab = 'Concentration (mg/L)', xlab = 'Time') I see the higher concentration points toward the right on several panels. But, when I change to using a line type (second attachment), xyplot(TDS ~ sampdate | she.s, data = sheep.cast, type = 'l', main = 'TDS in Sheep Creek', ylab = 'Concentration (mg/L)', xlab = 'Time') the higher concentrations are connected to points far to the left (earlier years). I expected to see a line with a few spikes toward the right sides of the panels. Where do I start to look for the reason for this behavior? TIA, Rich
sheep-TDS-year-dot.pdf
Description: Adobe PDF document
sheep-TDS-year-line.pdf
Description: Adobe PDF document
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