subtitle: "How information treatments on urban heat islands affect WTP for urban green spaces in Germany"
subtitle: "The Impact of Mandatory vs. Voluntary Treatments on Green Space Valuation"
title-slide-attributes:
data-background-image: Grafics/iDiv_logo_item.png
data-background-size: contain
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@@ -15,6 +15,7 @@ format:
smaller: true
logo: Grafics/iDiv_logo_item.PNG
scrollable: true
embed-resources: true
---
```{r, include=FALSE, cache=FALSE}
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@@ -24,6 +25,7 @@ source("Scripts/MAKE_FILE.R")
```{r loadlibs, include=FALSE}
library(tidyverse)
library(apollo)
library(texreg)
```
## Motivation
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@@ -34,15 +36,16 @@ library(apollo)
- We employ DCE to test influence of additional information on urban heat island on the valuation of UGS
**Research questions:**
## Research questions
1. How does an information treatment about urban heat islands affect survey engagement (interview time, cc time), quiz questions, consequentially and NR-Index?
2. How does additional information on urban heat islands affect the willingness to pay for UGS in a discrete choice experiment?
2. How do the different treatments affect the WTP for urban green spaces in the choice experiment?
3. Who chooses optional information?
4. Do people who choose voluntary information have a different WTP/preferences?
4. Do people who choose **voluntary** information have a different WTP/preferences?
## Discrete Choice Experiment
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@@ -50,6 +53,7 @@ library(apollo)
- Main attribute of interest here: naturalness defined by five-level graphical scale ▶ Range: hardly natural to very natural
- Three survey rounds; paper by Bronnmann et al. (2023) based on round 1 & 2, round 3 just finished end of February
- Mixed logit model with interactions in WTP space:
```{=tex}
\begin{equation}
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@@ -111,8 +121,11 @@ datatable(treatment_socio_C)
:::
:::
## NR OLS
**Hypotheses:** Individuals with greater Nature Relatedness (NR) are more inclined to autonomously seek information about environmental subjects, such as the impact of urban green spaces on urban heat islands. Consequently, any observed increase in the willingness to pay among the treated group may be attributed to the individuals' higher NR rather than the treatment itself.
```{r}
summary(nr_model_treat_A)
```
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@@ -122,16 +135,18 @@ summary(nr_model_treat_A)
Characteristics of the voluntarily treated persons
As protesting is not affected by the treatment we might see a treatment affect removing the protesters, which always choose opt-out.
<!-- As protesting is not affected by the treatment we might see a treatment affect removing the protesters, which always choose opt-out. -->
::: panel-tabset
### Scenario A
<!-- ::: panel-tabset -->
```{r}
summary(mxl_wtp_case_a_prot)
```
<!-- ### Scenario A -->
### Scenario B
<!-- ```{r} -->
```{r}
summary(mxl_wtp_case_b_prot)
```
<!-- summary(mxl_wtp_case_a_prot) -->
### Scenario C
<!-- ``` -->
```{r}
summary(mxl_wtp_case_c_prot)
```
:::
<!-- ### Scenario B -->
## NR Index
<!-- ```{r} -->
**Hypotheses:** Individuals with greater Nature Relatedness (NR) are more inclined to autonomously seek information about environmental subjects, such as the impact of urban green spaces on urban heat islands. Consequently, any observed increase in the willingness to pay among the treated group may be attributed to the individuals' higher NR rather than the treatment itself.