Table 2.

OLS regression estimation of factors affecting electricity used for cooling. Dependent variable: kWh/day.

Explanatory Variable(expected sign)Coefficient Estimate (Std. Error)Coefficient Estimate (Std. Error)
Mean daily PARz(+)   0.0028y
  (0.0002)
Mean daily high temperaturex(+)   0.0191y
  (0.0015)
Maximum daily high PARw(+)0.0008y
(0.0001)
Maximum daily high temperaturev(+)0.0166y
(0.0020)
R2        0.8014    0.7566
F (model)631.40486.35
N316.00316.00
  • zDaily PAR readings averaged across readings taken at 15-minute intervals, non-nighttime (PAR > 0).

  • ycoefficient statistically significant at 0.01 level.

  • xDaily temperature averaged across readings taken at 15-minute intervals, nonnighttime (PAR > 0).

  • wThe highest PAR value each day.

  • vThe highest temperature each day.