Naming conventions have been adopted for the weighting variables. This will help users to select the name of the weight they need or to identify the nature of a weight. The structure is as follows, and is consistent with (a subset of) the naming conventions for the main survey:
Naming convention for Innovation Panel weights w_XxxYyZz_aa
| Wave letter | Who are you studying? | Which questions(naire)? | Which sample/timeline? | Analysing one wave or across waves? |
|---|---|---|---|---|
| w_ (a to …) a_ b_ c_ d_ e_ f_ g_ | xxx (Hhold or individual) hhd: household psn: persons 0+ ind: persons 16+ yth: persons 10-15 | yy (instrument) en: enumeration in: interview px: interview or proxy 5m: “extra 5 minutes” sc: self-completion bp: blood pressure (only in IP12) bm height and weight (only in IP12) hs: hair sample (only in IP12) bs: dry blood spot (only in IP12) fb: full blood sample (only in IP12) | zz (samples cover different waves) ip: Innovation panel i1: Innovation panel since wave 4 (2011), including IP4 refreshment i2: Innovation panel since wave 7 (2014), including IP4 and IP7 refreshments i3: Innovation panel since wave 10 (2017) i4: Innovation panel since wave 11 (2018) i5: Innovation panel since wave 14 (2021) | _aa (cross-sectional/longitudinal) _xw: cross-sectional analysis weight _lw: longitudinal weight _xd: x-sectional design weight _li: issue weight |
Cross-sectional example
a_indinip_xw is the cross-sectional analysis weight for adult main interview data from IP Wave 1, representing the population of persons aged 16+.
Longitudinal weights for partial wave sets
An additional device is used to indicate weights for longitudinal analysis of combinations of waves that do not include all waves up to the current one (“partial wave sets”). This consists of a numeric indicator following the “ZZ” part of the variable name. The number is a decimal representation of the binary number that indicates the combination of waves, where 1 indicates inclusion and 0 indicates exclusion, and where the waves are in reverse order.
Partial wave sets example
For example, data from Waves 1, 3 and 4 can be represented by the binary number 1101, which translates to the decimal number 13 (1+4+8). Thus, d_indinip13_lw is the weight for individual interview data from Waves 1, 3 and 4 (whereas d_indinip_lw is the weight for the “complete wave set” of Waves 1, 2, 3 and 4). For ease, the variable label indicates the combination of waves, e.g. “(acd)” to indicate Waves 1, 3 and 4.
The partial wave sets presented with this release are 5 (Wave 1 and Wave 3) and 13 (Waves 1, 3, and 4), 29 (Waves 1,3,4,5), 61 (Waves 1,3,4,5,6), and 125 (Waves 1,3,4,5,6,7).
