The first page in the embed seen above give the descriptive statistics for the analysis. The next one is a mixed model analysis of the merged data set for three air pollutants (Carbon Monoxide, Nitrogen Dioxide, and Sulfur Dioxide) stations and the outcome of departure from normal temperature (DPNT) in tenths of degrees Fahrenheit. We found no effect of pollutants but there was an effect of elevation with higher levels elevation in meters and a significant random effect of date. Date was by month.
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Jnnuary correlation |
Because of this result I looked at the correlation with DPNT and elevation for each month in 2013 in Utah. The correlations are presented in the table at the bottom of this post. There were significant positive correlations for the winter months of December thru March with DPNT increasing in each of these months with elevation. The scatter plot for January where the relationship was strongest. In the summer months of July thru September, there were significant negative correlations which were weaker in magnitude (distance from zero) than those for January and December. The scatterplot for July (the strongest negative correlation) is presented below.
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July Correlation |
Month
|
Correlation
|
P-value
|
January
|
0.4507225
|
0.0001
|
February
|
0.2918966
|
0.0021
|
March
|
0.2167232
|
0.0236
|
April
|
-0.1209575
|
0.2102
|
May
|
-0.1022036
|
0.2926
|
June
|
0.0381272
|
0.6925
|
July
|
-0.3159874
|
0.0009
|
August
|
-0.2779292
|
0.0031
|
September
|
-0.2903617
|
0.0021
|
October
|
-0.1866295
|
0.0578
|
November
|
-0.0167705
|
0.8652
|
December
|
0.4267564
|
0.0001
|
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