The IQAIW (Índice QuintoAndar ImovelWeb) is a rental index for major Brazilian cities. The index is based on both new rental contracts (managed by QuintoAndar) and online listings from QuintoAndar's listings (including ImovelWeb).
Format
iqaiw
A data frame with 6 cities across multiple time periods
- date
Date of the observation
- name_muni
Name of the municipality. One of: Belo Horizonte, Brasília, Curitiba, Porto Alegre, Rio de Janeiro, São Paulo
- index
Rental price index, normalized to 100 at first observation per city
- chg
Monthly percent variation of the index
- acum12m
12-month accumulated variation of the index
- price_m2
Estimated rental price per square meter (R$/m²)
Details
The IQAIW was developed in 2023 and replaced the former IQA index. Given the change in methodology and data sources, the IQAIW is not directly comparable to the IQA index.
Methodology
Formally, the index is a hedonic double imputed index, controlling for quality changes using a flexible GAM specification with location variables. In this sense, the IQAIW is more theoretically sound than median stratified indices like FipeZap or the former IQA. The mixture of listings and contracts, however, lacks theoretical support and seems to be mainly driven by branding purposes.
The ImovelWeb brand was purchased by QuintoAndar in 2021-22 and the IQAIW symbolizes the merging of both brands. In other words, the original IQA could've been improved simply by adopting a hedonic methodology, without the need to mix data sources.
Examples
if (FALSE) { # \dontrun{
# Plot index over time for all cities
library(ggplot2)
ggplot(iqaiw, aes(x = date, y = index, color = name_muni)) +
geom_line() +
scale_color_benvi_d(pal_name = "qual_6", name = "City") +
labs(
title = "IQAIW: Rental Price Index",
x = "Date",
y = "Index (base = 100)"
) +
theme_benvi()
} # }