Skip to main content

Table 2 Regression models assessing the impact of wine glass size on volume of wine solda

From: Does wine glass size influence sales for on-site consumption? A multiple treatment reversal design

  Bar & Restaurant
Estimate (95 % CI) [p-value]
Bar
Estimate (95 % CI) [p-value]
Restaurant
Estimate (95 % CI) [p-value]
Modelling of the mean (identity link):    
(Intercept) 4.027 (2.644; 5.411) [<0.001]*** 3.869 (2.295; 5.443) [<0.001]*** 5.027 (3.402; 6.652) [<0.001]***
Busyness level (log) 0.815 (0.623; 1.008) [<0.001]*** 0.774 (0.539; 1.009) [<0.001]*** 0.677 (0.422; 0.931) [<0.001]***
Monday −0.044 (−0.143; 0.056) [0.389] −0.025 (−0.188; 0.139) [0.767] −0.149 (−0.298; 0.000) [0.052].
Tuesday −0.113 (−0.199;-0.028) [0.011]* −0.202 (−0.337;-0.066) [0.005]** −0.102 (−0.219; 0.015) [0.092].
Wednesday 0.014 (−0.082; 0.110) [0.777] 0.040 (−0.070; 0.150) [0.481] −0.063 (−0.218; 0.091) [0.423]
Thursday −0.002 (−0.114; 0.110) [0.973] 0.003 (−0.147; 0.154) [0.965] −0.059 (−0.238; 0.120) [0.522]
Friday 0.134 (0.024; 0.244) [0.019]* 0.071 (−0.128; 0.271) [0.486] 0.283 (0.167; 0.398) [<0.001]***
Saturday 0.177 (0.049; 0.304) [0.008]** 0.231 (0.049; 0.414) [0.015]* 0.309 (0.171; 0.448) [<0.001]***
Sunday −0.166 (−0.246;-.085) [<0.001]*** −0.119 (−0.234;-0.004) [0.045]* −0.219 (−0.345;-0.093) [0.001]***
Small glass −0.021 (−0.108; 0.066) [0.632] 0.058 (−0.068; 0.184) [0.367] −0.087 (−0.201; 0.028) [0.143]
Large glass 0.090 (0.019; 0.161) [0.015]* 0.134 (0.033; 0.236) [0.011]* 0.079 (−0.025; 0.183) [0.140]
Temperature −0.009 (−0.017;-0.001) [0.023]* −0.017 (−0.028;-0.007) [0.002]** −0.005 (−0.015; 0.005) [0.310]
Modelling of the variance (log link):    
(Intercept) −1.560 (−1.753;-.367) [<0.001]*** −1.123 (−1.328;-.919) [<0.001]*** −1.222 (−1.415;-.029) [<0.001]***
Small glass −0.053 (−0.408; 0.301) [0.769] −0.111 (−0.466; 0.243) [0.540] −0.179 (−0.527; 0.168) [0.315]
Large glass −0.638 (−0.996;-0.279) [0.001]*** −0.745 (−1.156;-0.333) [0.001]*** −0.451 (−0.809;-0.093) [0.015]*
Monday −0.358 (−0.705;-0.010) [0.047]* −0.038 (−0.375; 0.298) [0.823] 0.051 (−0.287; 0.390) [0.767]
Tuesday −0.071 (−0.395; 0.253) [0.670] 0.160 (−0.178; 0.497) [0.356] −0.193 (−0.525; 0.139) [0.258]
Wednesday 0.145 (−0.181; 0.471) [0.386] −0.257 (−0.614; 0.099) [0.160] 0.325 (−0.003; 0.652) [0.055].
Thursday 0.431 (0.102; 0.760) [0.012]* 0.325 (−0.008; 0.658) [0.059]. 0.510 (0.186; 0.834) [0.003]**
Friday 0.099 (−0.246; 0.443) [0.576] 0.464 (0.116; 0.811) [0.010]* −0.172 (−0.516; 0.172) [0.329]
Saturday −0.319 (−0.656; 0.018) [0.067]. −0.613 (−0.956;-0.270) [0.001]*** −0.491 (−0.818;-0.164) [0.004]**
Sunday 0.073 (−0.302; 0.447) [0.705] −0.039 (−0.415; 0.336) [0.838] −0.029 (−0.392; 0.334) [0.875]
  1. Significance key: ‘.’ for p-value < 0.1, ‘*’ for p-value < 0.05, ‘**’ for p-value < 0.01, ‘***’ for p-value < 0.001
  2. aThe outcome is the daily volume of wine sold on log scale. ‘Treatment’ contrasts with standard glass as reference were used for the glass size predictor. ‘Sum’ contrasts were used for the days of week. Parameter 95 % confidence intervals and p-values respectively appear in parenthesis and in square bracket