Northern Ireland Annual Descriptive House Price Statistics (Electoral Ward Level)

Annual descriptive price statistics for each calendar year 2005 – 2023 for 462 electoral wards within 11 Local Government Districts.

The statistics include:

• Minimum sale price

• Lower quartile sale price

• Median sale price

• Simple Mean sale price

• Upper Quartile sale price

• Maximum sale price

• Number of verified sales

Prices are available where at least 30 sales were recorded in the area within the calendar year which could be included in the regression model i.e. the following sales are excluded:

• Non Arms-Length sales

• sales of properties where the habitable space are less than 30m2 or greater than 1000m2

• sales less than £20,000.

Annual median or simple mean prices should not be used to calculate the property price change over time.
The quality (where quality refers to the combination of all characteristics of a residential property, both physical and locational) of the properties that are sold may differ from one time period to another. For example, sales in one quarter could be disproportionately skewed towards low-quality properties, therefore producing a biased estimate of average price.
The median and simple mean prices are not ‘standardised’ and so the varying mix of properties sold in each quarter could give a false impression of the actual change in prices. In order to calculate the pure property price change over time it is necessary to compare like with like, and this can only be achieved if the ‘characteristics-mix’ of properties traded is standardised. To calculate pure property change over time please use the standardised prices in the NI House Price Index Detailed Statistics file.

本数据集提供了2005年至2023年期间11个地方政府区域内462个选举选区的年度价格描述性统计数据。具体包括：

• 最小销售价格
• 最低四分位数销售价格
• 中位数销售价格
• 简单平均销售价格
• 最高四分位数销售价格
• 最大销售价格
• 经验证的销售数量

价格数据仅限于在日历年内至少记录了30次销售的区域，这些销售数据可用于回归模型，以下销售数据被排除在外：

• 非等距销售
• 销售面积小于30平方米或大于1000平方米的房产
• 销售价格低于20000英镑的

不应使用年度中位数或简单平均价格来计算房产价格随时间的变化。房产质量（此处质量指住宅房产所有物理和区位特征的组合）在不同时间段可能会有所不同。例如，某一季度的销售可能不成比例地偏向低质量房产，从而产生平均价格的偏差估计。中位数和简单平均价格未经标准化，因此每个季度销售的房产组合的多样性可能会给出对实际价格变化的错误印象。为了计算纯粹的价格随时间的变化，有必要进行比较类似的数据，而这只能通过标准化交易的房产的‘特征组合’来实现。要计算纯粹的价格随时间的变化，请使用NI房价指数详细统计数据文件中的标准化价格。