关于Excel表格中表观限值与真实限值合理性的技术问询

Hey there! Let’s walk through how to confirm if your apparent and true limits for those 2010 SDA age groups are set correctly—this is a common check with survey demographic data, so we’ve got clear rules to follow.

First, let’s get aligned on what these terms mean in this context, since that’s the foundation of checking your setup:

Key Terminology Recap #

• Apparent Limits: These should directly match the whole-number age group labels from the SDA frequency table (like 18-24 or 25-34). They’re the "visible" ranges that correspond to how SDA presents the data.
• True Limits: These account for the fact that age is a continuous variable (someone doesn’t hit exactly 18 until their birthday, and a group like 18-24 includes everyone up to just before their 25th birthday). For standard whole-number groups, true limits are calculated by adjusting the apparent limits by ±0.5.

Quick Checks to Verify Your Excel Setup #

Here’s how to spot if your limits are reasonable:

1. Apparent Limits Check:
   • If your lower and upper apparent limits exactly match the start and end numbers of SDA’s age group labels (e.g., SDA lists "18 to 24", your apparent limits are 18 (lower) and 24 (upper)), that’s spot-on.
2. True Limits Check:
   • For closed groups (with a clear start and end), use this formula:
     • Lower true limit = Lower apparent limit - 0.5
     • Upper true limit = Upper apparent limit + 0.5
     • Example: For an apparent group of 18-24, true limits would be 17.5-24.5
   • For open-ended groups (like 65+), the upper true limit stays open (you can note it as 64.5+ since there’s no upper bound to the group).
3. Count Alignment Check:
   • If you apply these limits to the raw age data, do the resulting group counts match exactly what SDA’s frequency table shows? If yes, that’s a surefire sign your limits are correctly set.

Need a Precise Verdict? #

If you can share a quick snippet of your Excel table (a few rows showing age group, apparent limits, true limits, and the corresponding SDA counts), I can give you a definitive "this works" or suggest small tweaks if needed!

内容的提问来源于stack exchange，提问作者yre